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first law of thermodynamics

قانون ِ نخست ِ گرماتوانیک

qânun-e naxost-e garâtavânik

Fr.: première loi de la thermodynamique

The total energy of a → closed system
is constant. This means that energy can be changed from one form to another,
or transferred from one system to another, but it cannot be created or destroyed.
A mathematical formulation of the first law is:
δQ = δU + δW,
where δQ is the heat transferred to the system, δU
the change in internal energy (resulting in a rise or fall of temperature), and
δW is the work done by the system.