Paani ka Gaayab Hona
Class 6 Science · Chapter 8: Paani ki Avasthaon ki Yaatra · NCERT Curiosity section 8.1–8.2
Seekho
Subah ki baarish ke baad Sahil khel ke maidaan mein jagah-jagah gaddhe dekhta hai. Dopahar tak wo gaayab. Paani kahan gaya? Sakht concrete mein nahi samaaya. Wo adrishya gas, bhaap (water vapour), banke hawa mein mil gaya.
Drav paani ka bhaap banna vashpan (evaporation) kehlata hai. Ye har taapmaan par, dheere, paani ki satah se hota hai: gaddhon, geele kapdon, jheelon, samudra, patton aur hamari twacha se bhi.
Kya paani wapas mil sakta hai? Garam paani ke bartan ke upar thandi steel plate pakdo: plate ke neeche chhoti boondein banti hain. Bhaap thandi hokar wapas drav bani. Ye sanghanan (condensation) hai. Thande gilaas ke bahar ki boondein hawa ki bhaap se aati hain, gilaas ke andar se nahi!
Explore: vashpan ya sanghanan?
- Har badlaav sort karo.
Yaad rakho
- Vashpan: drav paani → bhaap, satah se, kisi bhi taapmaan par.
- Sanghanan: bhaap thandi hone par → drav paani.
Quick check
Dhoop mein gaddhe ka paani kahan jaata hai?
- Bhaap banke hawa mein
- Nasht ho jaata hai
- Barf ban jaata hai
- Seedha drav boond banke baadal mein
Answer
Bhaap banke hawa mein. Vashpan hota hai: drav adrishya bhaap banke hawa mein jaata hai.
Socho
Rohan kehta hai thandi bottle ke bahar ki boondein bottle se risi hain. Kaise dikhaoge wo galat hai?
Ek answer
Andar rangeen paani (ya rang wali barf) daalo. Bahar ki boondein phir bhi saaf hongi, to andar se nahi aa sakti. Wo hawa ki bhaap ke thandi satah par sanghanit hone se aati hain.
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.