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CuriosityCh 8 Paani ki States ka Safar

A Journey through States of Water (Paani ki States ka Safar): Class 6 Science Chapter 8 Hinglish mein

Curiosity · Hinglish notes, simulations aur practice · Official NCERT chapter PDF ↗

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  • 95 min
  • 3 simulations
  • 16 practice questions
  • 26 MCQs

Is chapter mein aap kya seekhenge

  • Simple tests se dikhana ki ice, paani aur water vapour ek hi substance ki teen states hain
  • Roz ke examples se evaporation aur condensation samjhana, jaise kapdon ka sookhna aur thande glass par boondein aana
  • Solids, liquids aur gases ko unki shape, flow aur failne ke hisaab se compare karna
  • Batana ki garam aur thanda karne se paani ek state se doosri state mein kaise badalta hai
  • Ek fair test plan karna jisse pata chale ki surface area, heat, chalti hawa aur humidity evaporation ki speed ko kaise badalte hain
  • Matka aur pot-in-pot cooler mein evaporation ka cooling effect samjhana
  • Batana ki baadal aur baarish kaise bante hain, aur water cycle mein paani ka poora safar trace karna

NCERT Science Class 6, Chapter 8, pp. 143–162 par based original companion text. Yeh NCERT se juda nahi hai aur NCERT ne ise endorse nahi kiya hai.

Ice aur paani: ek jaise ya alag?

April ki ek dopahar, achanak aaye toofan mein school ke ground par ole (hailstones) girne lagte hain. Tum ek ola utha lete ho. Woh sakht aur barfeela hai, aur tum use ungliyon ke beech ghuma sakte ho. Ek minute baad tumhari hatheli mein bas paani ki kuch boondein bachti hain. Kya ice aur paani sach mein do alag cheezein hain?

Ek dost ko lagta hai ki yeh alag hain. Woh kehti hai ki drinks wali ice freezer se aati hai, to shayad freezer paani mein kuch naya mila deta hai. Tum yeh kaise check karoge? Ek scientist bahas karke faisla nahi karti. Woh ek simple test set karti hai aur dhyaan se dekhti hai.

2/4Cube melt hote hue chhota hota hai, aur neeche paani jama hota hai.

Fig. 8.1Ice aur paani ek doosre mein badal jaate hain, isliye yeh ek hi substance ki do states hain.NCERT p. 144

Ek transparent cup table par ek ghadi ke paas rakha hai. Pehle step mein sookhe cup mein ek ice cube hai aur ghadi 0 minute dikhati hai. Doosre step mein, 10 minute par, cube chhota ho gaya hai aur cup ke tale par paani ki patli layer hai. Teesre step mein, 30 minute par, cube gaayab hai aur cup mein sirf paani hai. Aakhri step mein cup freezer mein reh chuka hai, jo ek snowflake se dikhaya gaya hai, aur paani cup ki shape ka ice ka block ban gaya hai.

Ice, liquid water aur water vapour ek hi substance ki teen states hain. Phir bhi yeh bahut alag tarah se behave karte hain. Tum ice cube ko utha kar ungliyon mein palat sakte ho. Paani ke saath aisa karke dekho: woh ungliyon se beh kar zameen par tapak jaata hai. Is chapter mein hum paani ke saath chalenge, jab woh ek state se doosri state tak safar karta hai.

Quick check
2 mein se 1
Ice aur paani do alag substances hain.
Answer dekho

Answer Galat

Yeh ek hi substance ki do states hain. Melting ice ko paani bana deta hai, aur freezing use wapas ice bana deta hai.

8.1 Paani ke Gaayab Hone ki Jaanch

Monsoon ki tez baarish ke baad school ke ground par jagah-jagah puddles (paani ke chhote gaddhe) ban jaate hain. Chhutti ki ghanti bajne tak unmein se kai chhote ho jaate hain aur kuch gaayab ho jaate hain. Woh saara paani kahan gaya?

Ghar mein bhi paani gaayab hota hai. Dhone ke baad rack mein rakhi plates se paani tapakta hai, phir bhi ek ghante baad woh sookh jaati hain. Steel ki plate mitti jaisi nahi hoti. Kya paani steel mein ghus kar uske andar chhup sakta hai? Ya woh kahin aur chala jaata hai? Chalo, dono ideas ko test karte hain.

2/3Paani invisible vapour ban kar nikalta hai, isliye puddle chhota hota hai.

Fig. 8.2Paani upar se hawa mein jaata hai, plate ke paar nahi.NCERT Fig. 8.1 · p. 145

Ek steel plate tissue paper ke gulaabi square par rakhi hai. Shuru mein plate ke beech mein 'paani' label wala ek puddle hai. 1 ghante baad puddle lagbhag aadha chauda reh jaata hai aur usse 'invisible vapour' label wale dashed arrows upar uthte hain. 3 ghante baad plate sookh chuki hai aur ek dashed ring dikhati hai ki puddle kahan tha. Ek label kehta hai ki tissue poore time sookha rehta hai.

Paani ke paas nikalne ka sirf ek raasta tha: upar, hawa mein. Raaste mein woh water vapour ban gaya, jo gas ke roop mein paani hai. Water vapour hawa mein bina dikhe mil jaati hai, isliye hum use jaate hue nahi dekh paate.

Definition
Evaporation

Liquid water ka water vapour mein badalna (वाष्पन, vashpan). Yeh paani ki surface par hota hai, room temperature par bhi.

ExampleBalcony mein sookhti hui geeli school uniform.

Evaporation paani ke ubalne ka intezaar nahi karta. Yeh chupchaap hamesha hota rehta hai, thande kamre mein bhi. Geele baal sookh jaate hain. Notebook par ink sookh jaati hai. Baarish se dhuli sadak phir se sookh jaati hai. Heat ise tez kar deti hai: garam tawe par chhidki boondein chhann ki awaaz ke saath ek-do second mein gaayab ho jaati hain.

Ab chulhe par rakhi ek kettle ke baare mein socho. Jab paani ubalta hai, to tonti (spout) se ek safed dhaara nikalti hai. Bahut log ise steam kehte hain. Par dhyaan se dekho. Tonti ke bilkul sire par ek saaf khaali jagah (gap) hoti hai, aur safed dhaara thoda aage se shuru hoti hai.

3/4Thoda aage, vapour thandi hokar chhoti boondein ban jaati hai jo humein dikhti hain.

Fig. 8.3Water vapour invisible hoti hai. Safed mist liquid water ki chhoti-chhoti boondon se bani hai.NCERT p. 145

Jalte chulhe par ek kettle rakhi hai. Pehle step mein tonti se kuch nahi nikalta. Doosre step mein tonti ke theek bahar ek dashed ring saaf gap dikhati hai, jiska label hai 'saaf gap: vapour', jahan se invisible water vapour nikalti hai. Teesre step mein tonti se thoda door chhote circles ka ek baadal dikhta hai, jiska label hai 'chhoti boondon ki mist'. Aakhri step mein mist door udkar halki ho jaati hai, aur label kehta hai ki boondein phir se sookh jaati hain.

Saaf gap mein sirf water vapour hai, aur woh invisible hai. Thoda aage, vapour thandi hokar liquid water ki anginat chhoti boondein ban jaati hai. Wahi boondein tumhe dikhti hain. Jaldi hi woh phir se evaporate ho jaati hain, aur safed dhaara gaayab ho jaati hai.

Ab wapas puddles par chalte hain. Mitti wale playground par kuch paani mitti mein sokh jaata hai aur kuch evaporate ho jaata hai. Cement ki sadak par paani andar nahi ja sakta, isliye lagbhag saara evaporate hota hai. To mitti wale ground ke liye sahi jawab hai: dono.

Quick check
3 mein se 1
Inmein se kaun evaporation dikhata hai?
Answer dekho

Answer (D) Rassi par geele kapdon ka sookhna

Sookhte kapdon ka paani vapour ban kar nikalta hai, yahi evaporation hai. Tapakti ice cream melting hai, thandi bottle par boondein condensation hain, aur ice cubes banana freezing hai.

8.2 Ek aur Mystery

July ke ek chipchipe din fridge se thande paani ki bottle nikaalo. Kuch hi minute mein uska bahar ka hissa geela ho jaata hai. Chhoti boondein us par chha jaati hain, phir judkar neeche ludhakti hain. Bottle aisi lagti hai jaise use paseena aa raha ho. Yeh paani kahan se aata hai?

3/3Chhoti boondein judkar badi boondein banti hain jo neeche beh jaati hain.

Fig. 8.4Hawa ki vapour thande glass par boondein ban jaati hai, jabki andar paani ka level kam nahi hota.NCERT Fig. 8.2 · p. 146

Left mein barf jaise thande paani ka glass hai, jismein paani ke level par tape ka mark hai. Right mein glass ki deewar ka close-up hai, ek taraf thanda paani aur doosri taraf hawa jismein water vapour ke chalte hue dots hain. Pehle step mein glass sookha hai aur close-up mein hawa mein vapour dikhti hai. Doosre step mein glass ka bahar ka hissa halki mist se dhundhla hai, aur close-up mein thandi deewar par chhoti boondein banti hain. Teesre step mein boondein judkar badi boondein ban gayi hain, ek neeche behti hai, aur tale par thoda paani jama hota hai. Har step mein paani ka level mark par hi rehta hai.

Tumhari class mein bahut saare ideas aa sakte hain. Shayad paani glass ke paar leak hota hai. Shayad ice ke tukde bahar phisal kar melt ho jaate hain. Shayad boondein hawa se aati hain. Achhe scientists apna favourite idea chunne ke bajaaye har idea ko test karte hain. Dekho, do doston ne apne ideas kaise test kiye.

Step by step

Tara aur Kabir teen ideas test karte hain

Step 1 / 5

Teen andaaze

Tara teen andaaze likhti hai. Paani glass ke paar leak hota hai. Pighli ice rim ke upar se chadh kar neeche behti hai. Ya boondein glass ke aas-paas ki hawa se aati hain.

1 / 5

Yeh boondein tumne bahut jagah dekhi hain. Sardi ki subah ghaas dew (os) se geeli hoti hai. Ubalti daal ke bartan ke dhakkan ke neeche boondein hoti hain. Garam paani se nahaane ke baad bathroom ka shesha dhundhla ho jaata hai. AC wale kamre se bahar nikalte hi chashma dhundhla ho jaata hai.

Har case mein hawa ki water vapour kisi thandi cheez se milti hai. Vapour thandi hokar wapas liquid ki boondein ban jaati hai. Is badlaav ko condensation kehte hain.

Definition
Condensation

Water vapour ka liquid water mein badalna (संघनन, sanghanan). Yeh tab hota hai jab vapour thandi hoti hai, jaise kisi thandi surface ko chhoone par.

ExampleBarf wale paani ke glass ke bahar ki boondein.

Dew bhi isi tarah banti hai. Raat mein pattiyan aur ghaas heat kho deti hain aur aas-paas ki hawa se zyada thandi ho jaati hain. Hawa ki vapour un par condense ho jaati hai. Din chadhne tak dhoop pattiyon ko garam kar deti hai, aur dew phir se evaporate ho jaati hai.

3/4Vapour condense hokar dew ki boondein ban gayi hai.

Fig. 8.5Dew woh water vapour hai jo raat mein thandi hui pattiyon par condense ho gayi.NCERT p. 148

Zameen par ek badi patti aur ghaas ke tinke khade hain. Pehle step mein, garam shaam, suraj doob raha hai. Doosre step mein, chaand aur taaron wali thandi raat, patti ke paas water vapour ke dots jama hote hain, label hai 'patti thandi hoti hai'. Teesre step mein, subah ki dew, suraj ugte hi patti par aur ghaas ki nok par gol dew drops hain. Aakhri step mein suraj upar hai, boondein chhoti hoti hain, aur 'vapour upar uthti hai' label wale dashed arrows dew ka evaporate hona dikhate hain.

Kya condensation se paseena chhodte glass ki baat bhi samajh aa sakti hai? Kabir ka idea tha use tolna. Chalo, uska test karke dekhte hain.

3/3Aur boondein: 487.3 g, aur level nahi hila.

Fig. 8.6Glass bhaari hota hai jabki paani ka level wahi rehta hai, to extra paani hawa se aata hai.NCERT p. 149

Steel ke dhakkan se dhaka barf wale paani ka glass ek digital balance par rakha hai, aur paani ke level par tape ka mark hai. 0 minute par glass sookha hai aur display 486.0 g dikhata hai. 15 minute par bahar chhoti boondein hain aur display 486.7 g dikhata hai. 30 minute par badi boondein glass ko dhak leti hain, display 487.3 g dikhata hai, ek label kehta hai ki glass 1.3 g bhaari hua, aur mark dikhata hai ki paani ka level wahi hai.

ExampleNCERT Activity 8.4 · p. 149

Balance humein kya batata hai?

Meena ne tolne wala test kiya. Uske balance ne shuru mein 486.0 g aur 30 minute baad 487.3 g dikhaya. Andar paani ka level tape ke mark par hi raha. (a) Bahar kitna paani jama hua? (b) Woh kahan se aaya?

Pehle khud try karo. Phir solution ek-ek step karke kholo.

SimulationVapour aur thandi plate

Garam paani ka ek container, chalte particles ki tarah bana hua, saath mein ek thermometer. Kuch particles surface se vapour ban kar nikal jaate hain. Tum container ke upar ek thandi plate on kar sakte ho: jo vapour particles us tak pahunchte hain woh dheeme ho jaate hain aur uske neeche liquid ki boondon mein jama ho jaate hain. Ek temperature slider badalta hai ki particles kitni tezi se chalte hain aur kitne nikalte hain.

Fig. 8.7Simulation paani ko chhote-chhote chalte particles ki tarah dikhata hai. Garam paani se vapour nikalti hai, aur upar rakhi thandi plate use wapas boondein bana deti hai.
Try karo
  • Thandi plate ko off aur on karo. Har baar nikalte particles kahan pahunchte hain?
  • Paani ka temperature kam karo. Kya kam particles plate tak pahunchte hain?
Quick check
4 mein se 1
Thande glass ke bahar boondein isliye banti hain kyunki…
Answer dekho

Answer (A) hawa ki water vapour thande glass par condense hoti hai

Andar ka level wahi rehta hai aur glass bhaari hota hai, to paani hawa se aata hai. Risne se level girta aur glass halka hota.

8.3 Paani ki Alag-alag States kya hain?

Ab tak humne paani ko sakht ice, behte paani aur invisible vapour ke roop mein dekha. Yeh uski teen states hain: solid, liquid aur gas. Har state ko alag kya banata hai? Chalo, inhe haath mein lekar pata karte hain.

3/3Apni shape, shape leta hai, jagah bharti hai.

Fig. 8.8Solid apni shape rakhta hai, liquid apne container ki shape le leta hai, aur gas milne wali saari jagah bhar deti hai. Dots vapour ko dikhate hain, jise hum sach mein dekh nahi sakte.NCERT Table 8.3 · p. 150

Teen columns mein ice, paani aur water vapour dikhaye gaye hain. Pehle step mein ice cube ek gol katori mein hai, paani ek katori mein uthla pool banata hai, aur vapour, jo dots se dikhayi gayi hai, ek chhote band box mein bhari hai. Doosre step mein wahi ice cube bina badle ek lambe glass mein hai, wahi paani ab ek patle glass mein lamba column banata hai, aur vapour ke dots ek bahut bade band jar mein fail gaye hain. Aakhri step mein columns ke neeche labels aate hain: 'apni shape', 'shape leta hai' aur 'jagah bharti'.

Compare

Teeno states saath-saath

Solid (ice)

  • Iski apni shape hoti hai
  • Behta nahi hai
  • Fixed jagah gherta hai

Liquid (paani)

  • Apne container ki shape le leta hai
  • Behta hai aur surface par fail jaata hai
  • Fixed jagah gherta hai

Gas (vapour)

  • Iski apni koi shape nahi hoti
  • Har disha mein behti aur failti hai
  • Jahan tak pahunch sake, saari jagah bhar deti hai

Sirf paani hi solid, liquid ya gas nahi ban sakta. Apni classroom mein chaaron taraf dekho aur jo dikhe use group karo. Blackboard, tumhari steel ki paani ki bottle aur cricket ball solids hain. Ink, nariyal paani aur shahad liquids hain.

Gases ko pehchanna mushkil hai, kyunki zyadatar gases invisible hoti hain. Tumhare aas-paas ki hawa gases ka mixture hai, zyadatar nitrogen aur oxygen. Soda ki bottle ki fizz carbon dioxide gas hai. Kitchen ke gas stove mein jalne wala fuel bhi ek gas hai.

Gas dikhe ya na dikhe, tum pata laga sakte ho ki woh failti hai. Classroom ke ek kone mein santra chheelo. Jaldi hi doosre kone mein baithe doston ko uski khushboo aane lagti hai. Khushboo hawa mein safar karke un tak pahunch gayi.

Quick check
3 mein se 1
Kaunsi property sirf gases ki hoti hai?
Answer dekho

Answer (B) Woh milne wali saari jagah bhar deti hain

Liquids bhi behte hain, to behna sirf gases ki khaasiyat nahi hai. Sirf gas hi failkar poora container bharti hai. Fixed shape solids ki hoti hai.

8.4 Hum Paani ki States kaise Badal sakte hain?

Maan lo tum chahte ho ki ice cube jaldi melt ho. Tum use garam hatheli mein pakad sakte ho ya dhoop mein rakh sakte ho. Dono tareeke use heat dete hain, aur heat se ice melt hoti hai. Paani ko garam karte raho, to woh aur tezi se evaporate hota hai, jab tak ubal kar poora vapour na ban jaaye.

Ulti disha mein jaane ke liye heat hatao. Paani ko freezer mein rakho, to woh freeze hokar ice ban jaata hai. Water vapour ko thanda karo, to woh condense hokar liquid water ban jaati hai.

Definition
Melting

Garam karne par solid ka liquid mein badalna (पिघलना, pighalna).

ExampleGlass mein ice ka paani banna.

Definition
Freezing

Thanda karne par liquid ka solid mein badalna (जमना, jamna).

ExampleFreezer tray mein paani ka ice banna.

Doosre substances bhi melt aur freeze hote hain. Jalti mombatti ki lau ke paas wax ek saaf liquid ban jaata hai. Side se neeche behte hue woh thanda hokar phir sakht ho jaata hai. Ek chammach jama hua ghee garam roti chhoote hi pighal jaata hai. Aur North India ki kadaake ki sardi mein nariyal tel bottle ke andar hi jam kar safed solid ban jaata hai.

4/4Heating se paani seedhi par upar jaata hai; cooling se neeche aata hai.

Fig. 8.9Heat dene se paani seedhi par upar jaata hai. Heat hatane se neeche aata hai.NCERT Fig. 8.5 · p. 152

Teen boxes ek ke upar ek hain: neeche solid ice, beech mein liquid water, aur upar gas, yaani water vapour. Pehle step mein sirf boxes dikhte hain. Doosre step mein 'melting' label wala orange arrow ice se paani ki taraf upar jaata hai, aur 'freezing' label wala dashed blue arrow neeche aata hai. Teesre step mein 'evaporation' label wala orange arrow paani se vapour ki taraf upar jaata hai, aur 'condensation' label wala dashed blue arrow neeche aata hai. Aakhri step mein left mein ek lamba orange arrow kehta hai 'heat do', aur right mein ek lamba dashed blue arrow kehta hai 'heat hatao'.

SimulationGaram karo, thanda karo

Paani ka ek band container, particles ki tarah bana hua, saath mein ek thermometer aur ek label jo state ka naam batata hai. 0 °C se neeche particles ek saaf pattern mein baithe rehte hain aur bas hilte hain: yeh ice hai. 0 °C se upar garam karo to woh ek doosre ke paas se phisalte hain: liquid water. 100 °C ke paas woh door-door udkar container bhar dete hain: water vapour. Ek slider temperature ko −20 °C se 120 °C tak set karta hai.

Fig. 8.10Temperature slide karo aur paani ko ek state se doosri state mein badalte dekho. Label garam water vapour ko “steam” kehta hai: yeh wahi invisible gas hai.
Try karo
  • −10 °C se shuru karo aur paani ko dheere-dheere garam karo. Kis temperature par label liquid mein badalta hai?
  • Ise 110 °C tak garam karo, phir wapas thanda karo. Raaste mein tumhe state ke kaunse badlaav dikhte hain?
Quick check
3 mein se 1
Har badlaav ko uske naam se match karo.

Left mein koi item tap karo, phir right mein uska match.

Answer dekho
Answer
  • ice → paani : melting
  • paani → ice : freezing
  • paani → water vapour : evaporation
  • water vapour → paani : condensation
Heating se melting aur evaporation hote hain. Cooling se freezing aur condensation hote hain.

8.5 Paani ko Tez ya Dheere Evaporate kaise karein?

Kapde dhone wale din kuch kapde ek ghante mein sookh jaate hain aur kuch shaam tak geele rehte hain. April ke garam, hawadaar din rassi jaldi khaali ho jaati hai. Monsoon mein ek towel do din tak geela reh sakta hai. To koi cheez tay karti hai ki paani kitni tezi se evaporate hota hai.

Chalo, ek baar mein ek hi cheez test karte hain. Pehla sawaal: kya isse fark padta hai ki paani kitna faila hua hai?

3/3Plate sookh gayi. Cap abhi bhi geela hai.

Fig. 8.11Utna hi paani bade area par faila ho to kaafi tez sookhta hai.NCERT Table 8.4 · p. 154

Upar se dekhne par ek chhote bottle cap aur ek badi steel plate mein ek-ek teaspoon paani hai. Shuru mein dashed outlines cap mein paani ka chhota area aur plate par faila bada area dikhati hain. 1 ghante baad plate ka paani ek chhote hisse jitna reh gaya hai, jabki cap abhi bhi bhara dikhta hai. 3 ghante baad plate par 'sookha' likha hai aur cap par 'abhi bhi geela'.

ExampleNCERT p. 154

Fair test plan karo: kya hawa madad karti hai?

Arjun jaanna chahta hai ki kya hawa chalne se paani tez evaporate hota hai. Uske paas do bilkul ek jaise saucers, paani, ek teaspoon aur ek table fan hai. Uske liye ek fair test plan karo.

Pehle khud try karo. Phir solution ek-ek step karke kholo.

2/3Dhoop wali katori ka paani tezi se kam hota hai.

Fig. 8.12Dhoop ki garmi paani ko tez evaporate karti hai.NCERT Fig. 8.6 · p. 155

Do ek jaisi uthli steel katoriyan zameen par rakhi hain, ek left mein dhoop mein aur ek right mein ped ki chhaaon mein. Shuru mein dono mein barabar paani hai. 30 minute baad dhoop wali katori lagbhag aadhi khaali hai, aur usse vapour ke dashed arrows upar uthte hain, jabki chhaaon wali katori ka thoda sa hi paani kam hua hai. 1 ghante baad dhoop wali katori par 'sookha' likha hai aur chhaaon wali mein abhi bhi zyadatar paani hai.

Tumhare tests chaar cheezein dikhate hain jo evaporation ko tez karti hain. Bada surface zyada paani ko hawa se milne deta hai. Heat, dhoop ya chulhe se, paani ko garam karti hai. Chalti hawa paani ke theek upar ki nam hawa ko uda le jaati hai. Aur sookhi hawa vapour ko aasaani se le leti hai.

Aakhri point batata hai ki monsoon mein kapde der se kyun sookhte hain. Jab hawa mein pehle se bahut vapour hoti hai, to hum kehte hain ki humidity zyada hai. Aisi hawa nayi vapour ko bahut dheere leti hai. Isliye baarish ke dinon mein geele kapde der tak geele rehte hain.

SimulationEvaporation lab

Paani ki ek khuli dish, chalte particles ki tarah bani hui, saath mein ek thermometer aur ek counter jo batata hai kitne particles hawa mein nikal gaye. Controls se tum temperature badal sakte ho, hawa chala sakte ho, chhote aur bade surface ke beech switch kar sakte ho, aur dhakkan laga sakte ho. Garam particles zyada baar nikalte hain, hawa unhe door le jaati hai, bada surface zyada particles nikalne deta hai, aur dhakkan unhe nikalne se rok deta hai.

Fig. 8.13Ek baar mein ek cheez badlo aur bahar nikle particles ka counter dekho.
Try karo
  • Chhote surface ke saath 20 second tak nikle particles gino, phir bade surface ke saath. Baaki sab same rakho.
  • Hawa tez karo. Kya counter tezi se badhta hai?
  • Dhakkan laga do. Counter ka kya hota hai, aur kyun?
Quick check
4 mein se 1
Kaunsa towel sabse jaldi sookhega?
Answer dekho

Answer (D) Faila hua, dhoop mein, hawadaar din par

Bada surface, garmi aur hawa, teeno evaporation ko tez karte hain. Sirf dhoop mein faile, hawadaar din wale towel ke paas teeno hain. Towel tah karne se uska zyadatar surface hawa se chhup jaata hai.

8.6 Cooling Effect

Tapti dopahar mein mitti ke matke ka paani kamaal ka thanda lagta hai. Usi kamre mein steel ke bartan mein rakha paani garam hi rehta hai. Matke mein koi ice nahi daalta. To woh thanda kaise hota hai?

3/3Evaporation heat ko le jaata hai, isliye matke ka paani thanda hota jaata hai.

Fig. 8.14Paani mitti se riskar evaporate hota hai, heat ko saath le jaata hai aur andar ka paani thanda karta hai.NCERT p. 156

Steel ka ek bartan aur mitti ka ek matka, dono andar ka paani dikhane ke liye kate hue, aur dono mein ek-ek thermometer. Shuru mein dono thermometers ek hi reading dikhate hain aur label hai 'garam'. Doosre step mein matke ke bahar paani ki chhoti boondein dikhti hain, label hai 'bahar se geela', aur dashed arrows uski surface se vapour nikalte dikhate hain; steel ka bartan sookha rehta hai. Aakhri step mein 'heat nikalti hai' label wale orange arrows matke se door jaate hain, aur uska thermometer girta hai jiska label hai 'thanda', jabki steel ka bartan garam rehta hai.

Mitti mein bahut chhote-chhote chhed hote hain jinhe pores kehte hain. Thoda paani inse riskar matke ke bahar ka hissa nam rakhta hai. Yeh paani evaporate hota hai. Evaporate hone ke liye paani ko heat chahiye, aur woh yeh heat matke aur uske andar ke paani se leta hai. Isliye andar bacha paani thanda ho jaata hai. Yahi evaporation ka cooling effect hai.

Definition
Evaporation ka cooling effect

Jab kisi surface se paani evaporate hota hai, to woh us surface se heat le leta hai, isliye surface thandi ho jaati hai.

ExampleSkin se evaporate hota paseena tumhe thanda karta hai.

Yahi effect tum apni skin par bhi mehsoos karte ho. Jab paseena aata hai, to woh evaporate hokar tumhare shareer ko thanda karta hai. Pankha nam hawa ko door le jaakar madad karta hai, jisse paseena jaldi evaporate hota hai. Hand sanitiser thanda lagta hai kyunki woh bahut tezi se evaporate hota hai.

Log is trick ko kai tarah use karte hain. Garmiyon ki shaam ko parivaar garam aangan ya chhat par paani chhidakte hain. Paani evaporate hota hai to farsh thanda ho jaata hai. Khidkiyon par latkaayi geeli khus ki chataaiyan unke beech se aane wali hawa ko thanda kar deti hain.

4/4Upar geela kapda rakhte hain, aur evaporation andar ko thanda rakhta hai.

Fig. 8.15Geeli ret aur kapde se evaporate hota paani andar wale matke ko thanda rakhta hai.NCERT Fig. 8.7 · p. 157

Mitti ke do matkon ka kata hua view. Pehle step mein bade matke ke tale mein ret ki ek layer hai. Doosre step mein ek chhota matka uske andar ret par khada hai. Teesre step mein matkon ke beech ki jagah paani ke dots wali ret se bhari hai, label hai 'geeli ret'. Aakhri step mein ek gulaabi geela kapda chhote matke ko dhakta hai, andar tamatar aur ek mirchi hain jinka label hai 'andar thanda', aur dashed arrows ret aur kapde se water vapour nikalte dikhate hain.

Quick check
3 mein se 1
Mitti ke matke ka paani steel ke bartan ke paani se zyada thanda kyun rehta hai?
Answer dekho

Answer (D) Mitti se riskar bahar aaya paani evaporate hota hai

Riskar bahar aaya paani nam mitti se evaporate hota hai, aur evaporation andar ke paani se heat leta hai. Mitti khud thandi nahi hoti: sookha, khaali matka kamre jitna hi garam hota hai. Moti deewarein sirf garam hona dheema kar sakti hain; woh paani ko kamre se zyada thanda nahi kar sakti.

8.7 Baadal Humein Baarish kaise Dete hain?

Har din dhoop samundar, nadiyon, jheelon, geele kheton aur pattiyon se bahut saari water vapour upar uthati hai. Woh saari vapour kahan jaati hai? Garam, nam hawa upar ki taraf uthti hai. Aur jitna upar jao, hawa utni hi thandi hoti jaati hai. Isiliye Shimla jaise pahadi shehar May mein bhi thande rehte hain.

Aasmaan ko ek bahut bada thanda glass samjho. Upar uthti hawa jab kaafi thandi ho jaati hai, to uski vapour condense hoti hai, bilkul tumhare barf wale tumbler ki boondon ki tarah. Lekin upar condense hone ke liye koi glass nahi hota. Iske bajaaye vapour hawa mein tairte dhool, dhuein ya samundari namak ke kanon par jama hoti hai, jo itne chhote hote hain ki dikhte nahi. Har kan par paani ki ek chhoti si droplet chadh jaati hai. Anginat droplets ek saath tairti hain to baadal banta hai. To baadal liquid water hai (ya bahut thand mein ice ke chhote tukde), vapour nahi.

Baadal ki droplets itni chhoti aur halki hoti hain ki hawa mein tairti rehti hain. Idhar-udhar chalte hue woh ek doosre se takraati hain aur mil jaati hain. Baarish ki ek boond banane mein lagbhag das lakh cloud droplets lagti hain! Jab boond itni bhaari ho jaati hai ki hawa use sambhaal na sake, to woh baarish ban kar neeche aa jaati hai. Thand mein ya tez toofan mein paani snowflakes ke roop mein bhi gir sakta hai, ya ice ke gole ban kar, jinhe ole (hail) kehte hain.

5/5Tairne ke liye bahut bhaari boondein baarish ban kar girti hain.

Fig. 8.16Upar uthti hawa thandi hoti hai, vapour dhool par condense hokar droplets banati hai, droplets judti hain, aur bhaari boondein baarish ban kar girti hain.NCERT p. 157

Left mein ek arrow dikhata hai ki upar zyada thand hoti hai. Pehle step mein vapour dots wala garam, nam hawa ka ek bubble samundar se upar uthta hai. Doosre step mein bubble aur upar hai aur thanda ho gaya hai. Teesre step mein ek baadal ban gaya hai, aur 'baadal ke andar' label wala close-up panel dhool ke kaale kanon ke aas-paas paani ki droplets bante dikhata hai. Chauthe step mein baadal grey ho jaata hai aur close-up mein chhoti droplets ek badi boond se judti hain. Aakhri step mein baadal se baarish girti hai aur close-up mein ek bhaari boond girti dikhti hai.

Water cycle

Ab saare tukde jodo. Paani samundar, jheelon, nadiyon, mitti aur pattiyon se evaporate hota hai. Vapour upar uthti hai, thandi hoti hai aur condense hokar baadal banati hai. Baadal paani ko baarish, ole ya snow ke roop mein wapas neeche bhejte hain. Zameen par woh naalon aur nadiyon mein behta hai ya zameen mein sokh jaata hai, aur aakhir mein phir samundar tak pahunch jaata hai. Is kabhi na khatam hone wale chakkar ko water cycle kehte hain.

5/5Nadiyan aur groundwater paani ko wapas samundar tak le jaate hain.

Fig. 8.17Water cycle: paani Earth ki surface aur hawa ke beech lagaataar ghoomta rehta hai.NCERT Fig. 8.9 · p. 159

Ek landscape jismein left mein barf se dhaka pahaad, beech mein jheel aur nadi wali zameen, right mein samundar, aur zameen ke neeche groundwater ki ek layer hai. Pehla step batata hai ki paani kahan jama hai: samundar, jheel, nadi aur groundwater. Doosra step samundar aur jheel se upar uthte dashed arrows jodta hai, jinka label evaporation hai. Teesra step teen baadal jodta hai, labels hain baadal aur condensation. Chautha step jheel ke paas zameen par baadal se girti baarish aur pahaad ki choti par girti snow jodta hai. Aakhri step arrows jodta hai jo nadi ko jheel aur samundar tak neeche behte, aur groundwater ko samundar ki taraf behte dikhate hain.

Definition
Water cycle

Evaporation, condensation, baarish ya snow, aur wapas samundar tak behne ke zariye Earth ki surface aur hawa ke beech paani ka kabhi na khatam hone wala safar (जल चक्र, jal chakra).

ExampleBay of Bengal ka paani Meghalaya ki pahadiyon par monsoon ki baarish ban kar girta hai aur wapas samundar tak beh jaata hai.

Socho ki Earth ka saara paani ek litre ki bottle mein bhar diya jaaye. Usmein se lagbhag 975 mL khaara samundari paani hoga. Bache hue fresh water ka zyadatar hissa ice mein jama hai ya zameen ke bahut neeche chhupa hai. Jo fresh water hum aasaani se nadiyon, jheelon aur kuon se le sakte hain, woh mushkil se do teaspoon bharega. Shehar badhne ke saath zyada se zyada log in do teaspoon ko share karte hain, aur kai jagah har garmi mein paani kam pad jaata hai.

To har boond keemti hai. Brush karte waqt nal band rakho. Tapakte nal theek karwao. Sabziyan dhone wale paani ko paudhon mein daalo. Nadiyon aur taalaabon mein kabhi kachra mat phenko. Paani ki dekhbhaal ke baare mein tum Chapter 11, Nature’s Treasures mein aur seekhoge.

Quick check
4 mein se 1
Baarish banne ke steps ko sahi order mein lagao.
  1. Vapour dhool par condense hokar droplets banati hai
  2. Bhaari boondein baarish ban kar girti hain
  3. Upar jaakar hawa thandi hoti hai
  4. Droplets judkar badi boondein banti hain
  5. Garam, nam hawa upar uthti hai
Answer dekho
Answer
  1. Garam, nam hawa upar uthti hai
  2. Upar jaakar hawa thandi hoti hai
  3. Vapour dhool par condense hokar droplets banati hai
  4. Droplets judkar badi boondein banti hain
  5. Bhaari boondein baarish ban kar girti hain
Vapour condense ho sake, isse pehle hawa ko upar uthkar thanda hona padta hai. Phir droplets judkar badhti hain, jab tak girne layak bhaari na ho jaayein.
Flash cards · 9

Yaad rakhne wale words

1 / 9
Recap

Summary aur key points

  1. Ice, paani aur water vapour ek hi substance ki teen states hain (Ice aur paani).
  2. Khule mein rakha paani dheere-dheere invisible water vapour ban jaata hai. Yeh evaporation hai, aur yeh bina ubale bhi hota hai (Section 8.1).
  3. Kettle ke paas dikhne wali safed dhaara liquid ki chhoti boondein hain; water vapour khud invisible hoti hai (Section 8.1).
  4. Jab vapour kisi thandi cheez se milti hai, to wapas liquid ban jaati hai. Yeh condensation hai, jaise thande glass par ya dew ke roop mein (Section 8.2).
  5. Paseena chhodta glass bhaari ho jaata hai jabki uske paani ka level wahi rehta hai, to boondein hawa se aati hain (tolne wala test).
  6. Solids apni shape rakhte hain, liquids apne container ki shape le lete hain, aur gases milne wali saari jagah bhar deti hain (Section 8.3).
  7. Heating se melting aur evaporation hote hain; cooling se condensation aur freezing hote hain (Section 8.4).
  8. Bade surface, zyada heat, tez chalti hawa aur kam humidity se paani jaldi evaporate hota hai (Section 8.5).
  9. Fair test mein hum ek cheez badalte hain, baaki sab same rakhte hain aur result naapte hain (Section 8.5).
  10. Evaporation heat le jaata hai, jisse paseene wali skin, matka aur pot-in-pot cooler thande hote hain (Section 8.6).
  11. Upar uthti hawa thandi hoti hai, aur uski vapour dhool par condense hokar cloud droplets banati hai jo judkar baarish, ole ya snow ban kar girti hain (Section 8.7).
  12. Water cycle paani ko Earth ki surface aur hawa ke beech baar-baar ghumaata hai, aur fresh water bachana zaroori hai (Water cycle).
Practice · 16 questions

Practice questions answers ke saath (NCERT “Exercises”)

Sawaal 1–10 wahi skills practice karate hain jo NCERT exercises mein hain, par nayi situations mein. Baaki sawaal jaldi wale extra checks hain.

  1. Quick answerEasyNCERT Exercises Q1

    Inmein se kaunsa condensation ka example hai?

    Answer dekho

    Answer (D) Thandi soft-drink can ke bahar boondein banna

    Condensation vapour ka liquid banna hai, jaise thandi can par. Mitte hue pairon ke nishaan evaporation dikhate hain, kulfi melting dikhati hai, aur ice tray freezing dikhati hai.
  2. Short answerEasyNCERT Exercises Q2

    Har case mein woh kaam chuno jismein evaporation ka bada role hai.

    1. Deewar sajaana:

      Answer dekho

      Answer (A) water-based paint se paint karna

      Water-based paint tab sookhta hai jab uska paani evaporate ho jaata hai. Tape aur keel mein kuch sookhna nahi hota.

    2. Kitchen mein kaam:

      Answer dekho

      Answer (B) dhoop mein papad sukhana

      Papad dhoop mein sukhaaye jaate hain, taaki unka paani evaporate ho jaaye. Baaki kaamon mein kuch sookhna nahi hota.
  3. Short answerMediumNCERT Exercises Q3

    Ek hi colony mein do chhatein paas-paas hain. Ek par chhota sa lawn aur bahut saare gamle hain; doosri par sirf cement ki tiles hain. May ki dopahar mein paudhon wali chhat zyada thandi lagti hai. Samjhao kyun.

    Solution dikhao

    AnswerPattiyon aur nam mitti se evaporate hota paani heat le jaata hai, isliye paudhon wali chhat thandi rehti hai.

    Paudhe mitti se paani kheenchte hain aur uska kuch hissa pattiyon se water vapour ban kar chhodte hain. Gamlon aur lawn ki nam mitti se bhi paani evaporate hota hai.

    Evaporation aas-paas se heat leta hai, isliye paudhon ke paas ki hawa aur surfaces thandi ho jaati hain. Khaali tiles ke paas evaporate hone ke liye paani nahi hota. Woh sirf suraj ki garmi sokhti hain, isliye bahut zyada garam lagti hain.

  4. Short answerEasyNCERT Exercises Q4

    Sirf paani hi hawa mein gaayab hone wali liquid nahi hai. Teen aur liquids ke naam batao jinhe tumne evaporate hote dekha hai, aur batao ki har baar tumhe kaise pata chala ki woh evaporate ho rahi hai.

    Solution dikhao

    AnswerJaise: hand sanitiser, perfume ya attar, aur nail-polish remover.

    • Hand sanitiser hatheliyon se kuch second mein gaayab ho jaata hai aur unhe thanda chhod jaata hai.
    • Rui par laga perfume ya attar evaporate hote hue halka hota jaata hai, aur uski khushboo kamre mein fail jaati hai.
    • Rui par nail-polish remover ki kuch boondein lagbhag turant sookh jaati hain.
    • Petrol pump par petrol ki tez smell aati hai kyunki uska kuch hissa hawa mein evaporate hota hai.
  5. Long answerMediumNCERT Exercises Q5

    Riya kehti hai: “Pankha thandi hawa phenkta hai, aur thandi hawa evaporation ko dheema karti hai. To pankhe ke neeche kapde aur dheere sookhne chahiye.” Phir bhi uske kapde pankhe ke neeche jaldi sookhte hain. Uski soch mein galti kahan hai?

    Solution dikhao

    AnswerPankha hawa ko thanda nahi karta; woh bas use chalata hai. Chalti hawa kapde ke paas ki nam hawa ko door le jaati hai, isliye evaporation tez hota hai.

    Pankha bas kamre ki hawa ko chalata hai. Hawa room temperature par hi rehti hai, isliye Riya ka pehla step galat hai.

    Geele kapde ke paas ki hawa jaldi water vapour se bhar jaati hai, aur nam hawa aur vapour bahut dheere leti hai. Pankha is nam hawa ki jagah lagaataar sookhi hawa laata rehta hai, isliye paani tezi se evaporate hota rehta hai.

    Pankhe ke neeche humein thanda isliye lagta hai kyunki woh hamare paseene ka evaporation tez karta hai, aur yeh evaporation hamari skin se heat leta hai. Hawa khud thandi nahi hoti.

  6. Long answerMediumNCERT Exercises Q6

    Gahaai (threshing) ke baad ek kisaan geele dhaan ko khalihaan par patli layer mein faila deti hai. Woh use do din dhoop mein chhod deti hai. Uske baad hi use boriyon mein bhar kar tractor se godaam le jaaya jaata hai. Samjhao ki intezaar karne se paise kaise bachte hain aur anaaj sambhaalna kaise aasaan hota hai.

    Solution dikhao

    AnswerAnaaj se paani evaporate hota hai, isliye boriyan halki ho jaati hain. Har trip mein zyada anaaj jaata hai, to kam trips aur kam fuel lagta hai, aur sookha anaaj uthana aur store karna aasaan hota hai.

    Taaze gahe hue dhaan mein bahut paani hota hai. Patli layer mein failane par uska bada surface dhoop aur hawa ke liye khula hota hai. Isliye do din mein is paani ka kaafi hissa evaporate ho jaata hai.

    Ab wahi anaaj kam wazan ka hai. Tractor har trip mein zyada anaaj le ja sakta hai, isliye kam trips lagti hain aur fuel par kam paisa kharch hota hai. Halki, sookhi boriyan majdooron ke liye uthana aasaan aur safe bhi hai. Aur sookha anaaj godaam mein chipakta ya sadta nahi.

  7. ActivityEasyNCERT Exercises Q7

    Ghar par ek din ke liye “paani-gaayab diary” rakho. Paanch aise kaam likho jinmein evaporation hota hai. Har ek ke liye batao ki evaporation madad karta hai ya pareshaani hai. Evaporation ke baare mein jaanna tumhare parivaar ki kaise madad karta hai?

    Solution dikhao

    Ek sample diary:

    1. Rassi par sookhte kapde: madad karta hai.
    2. Pochhe ke baad sookhta farsh: madad karta hai.
    3. Chawal ke bartan se paani ubal kar khatam hona: pareshaani, agar chawal jal jaayein.
    4. Skin par sookhta paseena: thanda rakhne mein madad karta hai.
    5. Garam din mein khuli balti ka paani kam hona: pareshaani, kyunki paani barbaad hota hai.

    Evaporation ke baare mein jaanne se hum plan kar paate hain. Hum kapdon ko dhoop aur hawa mein failaate hain, rakhe hue paani ko dhak kar rakhte hain, aur peene ka paani thanda karne ke liye matka use karte hain.

  8. Short answerEasyNCERT Exercises Q8

    Ice cubes freezer se aate hain. Teen aisi jagahen ya mauke batao jahan nature khud solid paani banati hai.

    Solution dikhao

    AnswerOonche pahaadon par snow aur glaciers, North aur South Poles ke paas ice sheets, aur kuch toofanon mein ole.

    Oonche Himalaya saal bhar snow aur glaciers se dhake rehte hain. North aur South Poles ke paas ki zameen aur samundar ice ki moti sheets se dhake hain. Toofanon mein kabhi-kabhi ole girte hain. Bahut thandi sardi ki subah ghaas par jami os (frost) ek aur example hai.

  9. Long answerMediumNCERT Exercises Q9

    Tumhara school World Water Day ke liye posters bana raha hai. Earth ko blue planet kehte hain kyunki uska itna bada hissa paani se dhaka hai. To phir bhi humein paani kyun bachana chahiye? Do kaaran aur teen aise kaam batao jo tumhara parivaar kar sakta hai.

    Solution dikhao

    AnswerEarth ka zyadatar paani khaara hai, aur fresh water limited hai jabki use karne wale badhte ja rahe hain. Parivaar nal band kar sakte hain, leak theek karwa sakte hain aur paani dobara use kar sakte hain.

    Earth ka zyadatar paani khaara samundari paani hai. Sirf chhota sa hissa nadiyon, jheelon aur zameen ke neeche fresh water hai, aur woh har jagah barabar nahi bata. Logon ki sankhya badhne ke saath zyada logon ko yeh chhoti supply share karni padti hai, isliye kai jagah garmi mein paani kam pad jaata hai. Ganda paani use karne ke liye safe nahi hota, jisse supply aur bhi kam ho jaati hai.

    Ghar par hum brush karte waqt nal band kar sakte hain, tapakte nal theek karwa sakte hain, aur sabziyan dhone ka paani paudhon mein daal sakte hain. Hum yeh bhi dhyaan rakh sakte hain ki naaliyon aur taalaabon mein koi kachra na jaaye.

  10. Short answerMediumNCERT Exercises Q10

    Park ki steel ki slide garmi ki dopahar mein itni garam hoti hai ki chhoo nahi sakte. Use jaldi thanda karne ka ek tareeka batao, aur samjhao ki woh kaam kyun karta hai.

    Solution dikhao

    AnswerUs par thoda paani chhidko, ya geele kapde se ponchho. Paani evaporate hote hue slide se heat le leta hai.

    Slide par thoda paani chhidko, ya geele kapde se ponchho. Garam steel se paani jaldi evaporate hota hai, aur evaporation surface se heat leta hai. Kuch minute baad slide thandi ho jaati hai. Sookhne par phir se geela karne se woh aur thandi hoti hai.

  11. Quick answerEasy

    Water vapour ke wapas liquid water banne ko kehte hain.

    Answer dekho

    Answer condensation

    Condensation vapour se liquid mein badalna hai, evaporation ka ulta.
  12. Quick answerEasy

    Ek ice cube ko garam chulhe par rakhi khuli steel ki kadhai mein daal kar chhod diya jaata hai. Kadhai mein tumhe jo dikhega, use pehle se aakhir tak sahi order mein lagao.

    1. sirf paani, jo garam hota ja raha hai
    2. thode paani mein tairti ice
    3. ek khaali, sookhi kadhai
    4. ek solid ice cube
    Answer dekho
    Answer
    1. ek solid ice cube
    2. thode paani mein tairti ice
    3. sirf paani, jo garam hota ja raha hai
    4. ek khaali, sookhi kadhai
    Heat pehle ice ko melt karke paani banati hai. Aur heat se paani aur tezi se evaporate hota hai, jab tak woh ubal kar poora vapour na ban jaaye aur kadhai sookhi na reh jaaye.
  13. Quick answerMedium

    Har observation ko us badlaav se match karo jisse woh hota hai.

    Left mein koi item tap karo, phir right mein uska match.

    Answer dekho
    Answer
    • Rassi par sookhte kapde : evaporation
    • Subah ghaas par dew : condensation
    • Dhoop mein naram hota makkhan : melting
    • Freezer mein paani ka ice banna : freezing
    Sookhna evaporation hai, dew condensation hai, naram hota makkhan melting hai, aur ice banana freezing hai.
  14. Quick answerEasy

    Geele kapdon ko failaane se woh dher mein chhodne ke mukable jaldi sookhte hain.

    Answer dekho

    Answer Sahi

    Failaane se paani ka zyada surface hawa ko chhoota hai, isliye woh tez evaporate hota hai.
  15. Quick answerMedium

    Tolne wale ek test mein barf wale paani ke dhake glass ki reading shuru mein 352.4 g aur 20 minute baad 353.2 g thi. Bahar kitne gram paani condense hua?

    g
    Answer dekho

    Answer 0.8 g

    353.2 g−352.4 g=0.8 g paani hawa se thande glass par condense hua.
  16. Quick answerMedium

    Garam, sookhe, hawadaar din par kaunsa bartan peene ka paani sabse thanda rakhega?

    Answer dekho

    Answer (C) Chhaaon wali, hawadaar jagah par rakha mitti ka matka

    Paani mitti se riskar sookhi, chalti hawa mein sabse tez evaporate hota hai, jisse andar ka paani thanda hota hai. Chhaaon suraj ko use garam karne se rokti hai.

Apna NCERT exercise question dhoondo

Hamare practice questions ncert.ai ke liye likhe gaye hain aur NCERT exercises ko follow karte hain. Apni textbook ke question se match karne wala question dhoondo; uska answer uske saath hai.

Tumhari NCERT textbook meinYahan practice question
NCERT Exercises Q1Practice Q1
NCERT Exercises Q2Practice Q2
NCERT Exercises Q3Practice Q3
NCERT Exercises Q4Practice Q4
NCERT Exercises Q5Practice Q5
NCERT Exercises Q6Practice Q6
NCERT Exercises Q7Practice Q7
NCERT Exercises Q8Practice Q8
NCERT Exercises Q9Practice Q9
NCERT Exercises Q10Practice Q10

Quick check: MCQs

  1. Ice aur paani: ek jaise ya alag?2 questions
  2. 8.1 Paani ke Gaayab Hone ki Jaanch3 questions
  3. 8.2 Ek aur Mystery4 questions
  4. 8.3 Paani ki Alag-alag States kya hain?3 questions
  5. 8.4 Hum Paani ki States kaise Badal sakte hain?3 questions
  6. 8.5 Paani ko Tez ya Dheere Evaporate kaise karein?4 questions
  7. 8.6 Cooling Effect3 questions
  8. Water cycle4 questions
Glossary · 13

Key terms (English + Hindi)

condensationसंघननsanghanan
Thanda hone par water vapour ka liquid water mein badalna.Chapter mein pehli baar yahan aaya →
cooling effectशीतलन प्रभावsheetalan prabhav
Kisi surface ka thanda hona jab uspar se paani evaporate hokar heat le jaata hai.Chapter mein pehli baar yahan aaya →
dewओसos
Paani ki boondein jo raat mein thandi pattiyon aur ghaas par hawa ki vapour condense hone se banti hain.Chapter mein pehli baar yahan aaya →
evaporationवाष्पनvashpan
Liquid water ka water vapour mein badalna. Yeh surface par hota hai, room temperature par bhi.Chapter mein pehli baar yahan aaya →
freezingजमनाjamna
Thanda karne par liquid ka solid mein badalna.Chapter mein pehli baar yahan aaya →
gasगैसgais
Aisi state jiski apni shape nahi hoti aur jo failkar milne wali saari jagah bhar deti hai, jaise water vapour.Chapter mein pehli baar yahan aaya →
humidityआर्द्रताaardrata
Hawa mein kitni water vapour hai, uska maap. Humid dinon mein geeli cheezein der se sookhti hain.Chapter mein pehli baar yahan aaya →
liquidद्रवdrav
Aisi state jo behti hai aur container ki shape le leti hai, par volume wahi rehta hai, jaise paani.Chapter mein pehli baar yahan aaya →
meltingपिघलनाpighalna
Garam karne par solid ka liquid mein badalna.Chapter mein pehli baar yahan aaya →
solidठोसthos
Aisi state jo apni shape khud rakhti hai aur behti nahi, jaise ice.Chapter mein pehli baar yahan aaya →
stateअवस्थाavastha
Woh roop jismein koi substance ho sakta hai: solid, liquid ya gas.Chapter mein pehli baar yahan aaya →
water cycleजल चक्रjal chakra
Evaporation, condensation, baarish ya snow, aur behne se Earth ki surface aur hawa ke beech paani ka kabhi na rukne wala safar.Chapter mein pehli baar yahan aaya →
water vapourजलवाष्पjalvashp
Gas state mein paani. Yeh invisible hoti hai aur hawa mein mil jaati hai.Chapter mein pehli baar yahan aaya →

Tum chapter ke end tak pahunch gaye