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एक प्रक्रम में निष्काय द्वारा 701 J ऊष्मा अवशोषित होती हैं एवं 394 J कार्य किया जाता हैं । इस प्रक्रम में आन्तरिक ऊर्जा में कितना परिवर्तन होगा ?

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प्रस्तुत प्रश्नानुसार ,
`q = +701 J, w = - 394 J`
ऊष्मागतिकी के प्रथम नियम के अनुसार,
`DeltaU q + w = +701 +(-394) = +307 J`
इस प्रकार आन्तरिक ऊर्जा 307 J बढ़ती है ।

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