एक कार्यकलाप का वर्णन करके बताएं कि द्रव के वाष्पन से ठंडक उत्पन्न होती है?
class-9
book-bharti bhavan
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Answer:cooling of water in a pitcher or clay pot
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Answer:
kriyakalap ka varnan Karke bataen ki daru ke bachpan se thandak utpann Hoti hai
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