Hawa
Class 6 Science · Chapter 11: Prakriti ke Khazaane · NCERT Curiosity section 11.1
Seekho
Ira ki daadi kehti hain, "Prakriti humein muft mein khazaane deti hai: hawa, paani, dhoop, jungle, mitti." Prakriti ki ye upyogi cheezein prakritik sansaadhan (natural resources) kehlaati hain. Us se shuru karein jo hum har second use karte hain: hawa.
Hawa gaseon ka mishran hai. Lagbhag 78% nitrogen aur 21% oxygen; baaki 1% mein carbon dioxide, bhaap aur doosri gaseein, saath mein dhool aur dhuaan.
Hum aur jaanwar oxygen saans mein lete hain; paudhe khaana banaane ke liye carbon dioxide use karte hain aur oxygen chhodte hain. Chalti hawa (wind) pawan chakki ghumaati hai, kapde sukhaati hai, beej le jaati hai aur chidiyon ko tairne mein madad karti hai.
Gaadiyon, factoryon aur jalte kachre ka dhuaan hawa ko pradooshit karta hai, jisse saans ki dikkat ho sakti hai. Ped lagaana, public transport use karna aur kachra na jalaana hawa saaf rakhte hain.
Explore: hawa saaf rakho.
- Har kaam sort karo.
Yaad rakho
- Prakritik sansaadhan prakriti se milne wali upyogi cheezein hain.
- Hawa mishran hai: lagbhag 78% nitrogen, 21% oxygen aur thodi doosri gaseein.
Quick check
Hawa mein lagbhag kitni oxygen hai?
- 21%
- 78%
- 50%
- 1%
Answer
21%. Hawa lagbhag 78% nitrogen aur 21% oxygen hai.
Socho
'Khaali' bottle mein hawa hai, ye kaise dikhaoge?
Ek answer
Bottle ulti karke paani ki baalti mein dabaao aur tirchhi karo: hawa ke bulbule nikalte hain. Ya mooh par gubbaara lagaakar bottle garam paani mein daalo: andar ki hawa failkar gubbaara thoda phulaati 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.