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Paani ki Avastha Badalna

Class 6 Science · Chapter 8: Paani ki Avasthaon ki Yaatra · NCERT Curiosity section 8.4

Seekho

Freezer se barf nikaalkar katore mein rakho. Wo pighalkar paani banti hai: thos → drav. Shuddh barf 0 °C par pighalti hai. Paani freezer mein rakho to jamkar barf banta hai: drav → thos.

Bartan mein paani garam karo. Bulbule badhte hain, aur 100 °C par paani ubalta hai, poore drav mein jaldi bhaap banta hai. Bhaap thandi karo to sanghanit hokar wapas paani banti hai.

ice ⇄ water ⇄ water vapour (melting/freezing, evaporation/condensation)

Garam karne se thos → drav → gas. Thanda karne se gas → drav → thos. Ye avastha ke badlaav hain: padaarth poore samay paani hi rehta hai.

Explore: paani garam aur thanda karo.

  1. Paani ko thanda karo jab tak barf na ban jaaye.
  2. Ab garam karo jab tak bhaap na ban jaaye.
  3. Wapas kamre ke taapmaan (lagbhag 25 °C) par drav paani banao.

Yaad rakho

  • Pighalna (0 °C), jamna, ubalna (100 °C), vashpan aur sanghanan avastha ke badlaav hain.
  • Garam karna: thos → drav → gas. Thanda karna: gas → drav → thos.

Quick check

Paani ka barf banna kehlata hai …

  1. jamna
  2. pighalna
  3. vashpan
  4. sanghanan
Answer

jamna. Drav → thos jamna hai.

Socho

Kya ubalna aur vashpan ek hi hain? Kaise alag hain?

Ek answer

Dono drav paani ko bhaap banaate hain. Vashpan kisi bhi taapmaan par dheere, sirf satah se hota hai. Ubalna tez, 100 °C par, poore drav mein bulbulon ke saath hota hai.

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.