Land breeze aur sea breeze

Garam ret, thanda paani

Sardi ki chhuttiyon mein Kerala ke beach par Palden ne kuch dekha. Din mein ret samudra ke paani se zyaada garam lagi, par raat mein ret paani se thandi thi. Alag cheezein alag raftaar se garam aur thandi hoti hain, aur kinaare par isi wajah se har din hawa ki disha badalti hai.

Dhoop mein mitti aur paani

Activity 7.4 isi ko jaanchti hai. Do ek jaise katoron mein aadhe tak, ek mein mitti aur ek mein paani bhara jaata hai, aur har ek mein thermometer lagaya jaata hai, jiska bulb mitti ya paani ke andar ho par katore ko na chhoote. Set-up dhoop mein rakha jaata hai, aur har 5 minute mein taapmaan likha jaata hai.

Samay	Thermometer kya dikhate hain (sample)
0 minute	mitti 28 °C, paani 28 °C
10 minute	mitti 34 °C, paani 30 °C
20 minute	mitti 38 °C, paani 32 °C

Utne hi samay mein mitti ka taapmaan paani se zyaada badhta hai, yaani mitti paani se jaldi garam hoti hai. Dono katore andar laane par mitti jaldi thandi bhi hoti hai. (Tumhari readings din par nirbhar karengi; pattern wahi rahega.)

Din mein sea breeze

Din mein samudra ke paas ki zameen paani se jaldi garam hoti hai. Garam zameen ke upar ki hawa garam hokar phailti hai, halki hoti hai aur upar uthti hai. Samudra ke upar ki thandi hawa uski jagah lene aati hai. Samudra se zameen ki taraf chalne waali ye thandi hawa sea breeze hai. Garam dinon mein ye raahat deti hai, isiliye samudri ilaakon ke gharon ki khidkiyan aksar samudra ki taraf hoti hain.

Raat mein land breeze

Sooraj doobne ke baad ye ulta ho jaata hai. Dhoop na hone par zameen samudra ke paani se jaldi thandi ho jaati hai. Ab samudra ke upar ki hawa garam hoti hai, isliye wo uthti hai, aur zameen ki thandi hawa uski jagah lene samudra ki taraf jaati hai. Zameen se samudra ki taraf chalne waali ye thandi hawa land breeze hai. Samudra ke kinaare rehne waale log dekhte hain ki din mein hawa ek taraf chalti hai aur raat mein doosri taraf.

Hawa ka roz ka chakkar

Dono hawayein convection ka kaam hain: garam hawa uthti hai, thandi hawa neeche aakar zameen ke paas bagal se aati hai, aur upar hawa wapas jaakar chakkar poora karti hai. Din aur raat mein bas ye badalta hai ki zameen aur samudra mein kaun zyaada garam hai.

Samay	Kya hota hai
Din	zameen garam; hawa zameen ke upar uthti hai; sea breeze samudra se zameen ki taraf
Raat	samudra garam; hawa samudra ke upar uthti hai; land breeze zameen se samudra ki taraf

Kinaare par mausam halka kyun

Paani dheere garam aur dheere thanda hota hai, isliye bade jal srot garmi ke bhandaar ki tarah kaam karte hain. Din mein samudra zameen se thanda rehta hai aur uski hawa kinaare ko thanda karti hai; raat mein samudra garam rehta hai aur paas ki hawa ko bahut thanda nahi hone deta. Isliye samudra ke paas ki jagahon, jaise Kerala ke kinaare, ka taapmaan andar ke ilaakon se halka rehta hai, jahan din kaafi zyaada garam aur raatein kaafi zyaada thandi ho sakti hain.

Log aur ye hawayein (Extra)

Land aur sea breeze ne samudri zindagi ko bahut pehle se dhaala hai. Paramparik roop se paal waali naavon ke machhuaare subah jaldi nikalte hain, jab land breeze samudra ki taraf chalti hai, aur din mein baad mein sea breeze ke saath laut-te hain.

Garmi ke teeno raaston ke baare mein padho conduction, convection aur radiation mein. Textbook ke sawaalon ke jawab Chapter 7 ke NCERT solutions mein hain; poore chapter ke liye Chapter 7 ke notes.