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An ideal gas is compressed at a constant temperature; will its internal energy increase or decrease? |
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Answer» As per first law of thermodynamics, conservation of energy is dq = du + pdV, where dq = thermal energy of gas du = change in internal energy of gas pdV = work done by gas in expanding due to change in volume dV If T = const., dT = 0 and d(pV) = 0 as pressure and If T = const., dT = 0 and d(pV) = 0 as pressure and volume are inversely proportional. Also, dq = pdV, which shows that there is no change in internal energy. |
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