Chapter 8: Paani ki Avasthaon ki Yaatra
Gaddhe gaayab hote hain, thande gilaas bahar se geele hote hain, baadal baraste hain. Is chapter mein hum paani ke vashpan, sanghanan, pighalne aur jamne ko dekhenge, jaanenge vashpan kya tez karta hai, vashpan thanda kyun karta hai, aur jal chakra baarish kaise laata hai.
Is chapter mein tum
- vashpan aur sanghanan samjhaana
- paani ki teen avasthaayein aur unka badalna batana
- vashpan tez karne wali cheezein batana
- thandak ka asar aur jal chakra samjhaana
Topics
- Paani ka Gaayab Hona NCERT 8.1–8.2
Vashpan: drav paani → bhaap, satah se, kisi bhi taapmaan par.
- Paani ki Avasthaayein NCERT 8.3
Paani thos (barf), drav (paani) aur gas (bhaap) roop mein hota hai.
- Paani ki Avastha Badalna NCERT 8.4
Pighalna (0 °C), jamna, ubalna (100 °C), vashpan aur sanghanan avastha ke badlaav hain.
- Tez ya Dheema Vashpan NCERT 8.5
Zyada satah, garmi, hawa aur kam humidity se vashpan tez hota hai.
- Thandak ka Asar NCERT 8.6
Vashpan thandak deta hai: satah se garmi leta hai.
- Baadal Baarish Kaise Dete Hain NCERT 8.7
Vashpan, sanghanan aur baarish jal chakra mein paani ko ghumaate hain.
Key words
- Evaporation
- drav paani ka bhaap banna
- Condensation
- bhaap ka wapas drav paani banna
- Melting / freezing
- thos → drav / drav → thos
- Boiling point
- paani ke liye 100 °C
- Humidity
- hawa mein bhaap ki maatra
- Water cycle
- dharti aur aasmaan ke beech paani ki anant yaatra
Summary
- Paani thos, drav aur gas hota hai, aur garam ya thanda karne par avastha badalta hai.
- Vashpan kisi bhi taapmaan par satah se hota hai; ubalna 100 °C par.
- Satah, garmi, hawa aur humidity vashpan ki gati badalte hain; vashpan thandak deta hai.
- Vashpan, sanghanan aur baarish milkar jal chakra banaate hain.