Paani ki Avasthaayein
Class 6 Science · Chapter 8: Paani ki Avasthaon ki Yaatra · NCERT Curiosity section 8.3
Seekho
Paani akela aam padaarth hai jo hum roz teeno avasthaon mein dekhte hain: thos (barf, snow, ole), drav (baarish, nadiyaan, nal ka paani) aur gas (bhaap, hawa mein adrishya).
Thos barf ka aakaar aur aayatan dono nishchit. Drav paani ka aayatan nishchit par bartan ka aakaar leta hai: gilaas ka paani katore mein daalo, aakaar badalta hai, maatra nahi. Bhaap ka na aakaar nishchit na aayatan: jitni jagah mile usme fail jaati hai.
(Ubalti ketli ke upar dikhta safed baadal khud bhaap nahi: ye chhoti boondein hain jo adrishya bhaap ke hawa mein thanda hone se banti hain.)
Explore: kaunsi avastha?
- Paani ka har roop sort karo.
Yaad rakho
- Paani thos (barf), drav (paani) aur gas (bhaap) roop mein hota hai.
- Thos: aakaar aur aayatan nishchit. Drav: aayatan nishchit. Gas: dono nahi.
Quick check
Paani ki kis avastha ka aayatan nishchit par aakaar nahi?
- Drav
- Thos
- Gas
- Teeno
Answer
Drav. Drav paani apni maatra rakhta hai par bartan ka aakaar leta hai.
Socho
Gilaas mein barf pighalne par kya paani ki maatra badalti hai? Kaise jaanchoge?
Ek answer
Dravyamaan wahi rehta hai. Barf wale band dabbe ko pighalne se pehle aur baad tolo: padhai wahi aati hai. Paani ne sirf avastha badli.
Practice
Teen levels (easy, medium, hard) ke naye sawaalon se practice karo, kuch hands-on, hints aur hal ke saath. Topic poora karne ke liye pichhle 5 mein se 4 sahi karo.