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`C_2H_6` की दहन ऊर्जा `-341.1` किलो - कैलोरी है तथा `C_2H_2` की `-130.0` किलो - कैलोरी, परन्तु `C_2H_2` अच्छा ईंधन है

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`C_2H_6` उष्माय ईंधन मान
`=(-341.1)/(30)=-11.37` किलो-कैलोरी/ग्राम
`C_2H_2` का उष्मीय ईंधन मान
`=(-310)/(26)=-11.92` किलो - कैलोरी/ग्राम
अच्छा ईंधन वह होता है जिसका उष्मीन ईंधन मन ( calorific value ) अधिक हो । उष्मीय ईंधन का मान केलोरिन/ग्राम से दिया जाता है ।

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