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State the first law of thermodynamics....

State the first law of thermodynamics.

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First law of thermodynamics : If heat is supplied to a system capable of doing external work, the increase in its internal energy equals the heat supplied to the system minus the external work done by the system.
It dQ is the heat supplied to a system and dW is the external work done by the system, the increase in the internal energy of the system is
`dE=dQ-dW " " :. dQ=dE+dW`
which is the differential form of the first law of thermodynamics where all quantities are expressed in the same units.
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