What is first law of thermodynamics .
First law of thermodynamics
The first law of thermodynamics states that the energy of an isolated system is constant.
ΔU = q + W, is the mathematical statement of the first law of thermodynamics.
where ΔU is the change in the internal energy of the system, q is the heat transferred and W is the work done. It basically means that energy can neither be created nor be destroyed, although it can be converted from one form to another. The first law of thermodynamics is actually an expression of the principle of conservation of energy .