Question

What is first maxwell equation.

Answer 1

Maxwell equtions are famous in Electrodynamics as well as in thermodynamics.Irony is that in both branch there are four set of equations.

Here I am going to write Maxwell first equation in thermodynamics.

$$\Bigg(\frac{dT}{dV}\Bigg)_{S}=-\Bigg(\frac{dP}{dS}\Bigg)_{V}$$

This equation of Maxwell is called first equation of thermodynamics and It is derived from internal energy (U) that is only function of temperature. Here P , V , T and S are pressure, volume, temperature and entropy respectively.