Question

State the $1^{st}$ law of thermodynamics. Also give mathematical expression.

Answer 1

The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic systems. The law of conservation of energy states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but can be neither created nor destroyed.

Mathematical expression is, $\Delta U=Q+W$