What are the signs of convention adopted in the first law of thermodynamics ?
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What are the signs of convention adopted in the first law of thermodynamics ?
What are the signs of convention adopted in the first law of thermodynamics ?
The system of taking plus/minus sign with the three quantities (dQ. dW and dU) involved, is as follows:
(a) When heat is supplied to a system. dQ is taken as positive.When a gas is compressed, work is done on the gas, dW is taken as negative.
(b) When temperature of a gas increases its internal energy increases, dU is taken as positive. When temperature of a gas decreases, its internal energy decreases, dU is taken as negative.
(c) When a gas expands, work done by the gas dW is taken as positive. When a gas is compressed, work is done on the gas, dW is taken as negative.