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एक ठोस पिण्ड पर किसी ताप पर एकसमान दाब p लगाया जाता है । पिण्ड का ताप कितना बढ़ाया जाये की पिण्ड अपना प्रारम्भिक आयतन पुनः प्राप्त (restore ) कर ले?

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माना पिण्ड का प्राम्भिक आयतन V है तथा दाब p लगाने पर `Delta V` आयतन घाट जाता है । तब उसके पदार्थ का आयतनात्मक गुणांक
`B = (p)/(Delta V//V) " "…(i)`
पुनः यदि पिण्ड का ताप `Delta T` बढ़ाने पर पिण्ड के आयतन में वृद्धि `Delta V` हो, तो
`Delta V = gamma V Delta T " " ...(ii)`
`gamma` पिण्ड के पदार्थ का आयतन-प्रसार-गुणांक है । समीकरण (i) व (ii) से
अथवा `Delta T = (p)/(gamma B)`

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