Write the mathematical expression for first law of thermodynamics


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state first law of thermodynamics.give its mathematical expression. name the physical quantity defined by first law of thermodynamics.

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Total energy of a closed system is constant.  Energy can neither be created nor destroyed. It can be transformed from one form to another.

heat supplied to a system by the environment
     = increase in internal energy + work done by the system on the environment
ΔQ = ΔU + W


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