What is first law of thermodynamics?

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First law of Thermodynamics -
The first law of thermodynamics states that the total energy of an isolated system is constant.
Energy can be transformed from one form to another, but can neither be created not destroyed.

$Δ U = q + W$
where
$q =$ Heat supplied to the system
$W =$ Work done by the system
$Δ U =$ Change in internal energy of system.

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