8. आप कैसे सिद्ध करेंगे कि वाष्पन से ठंडक उत्पन्न होती है
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jab washpn hota hai tab garam air uppar chali jati hai aur thndi air ruk jati hai kiyuki thndi air me sab kand apas me Jude ho te hai aur garam air ke kand ek dusre se dur bhagte hai es karand washpan se thndak utpan hoti hai
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