# Second Law of Thermodynamics

Written by Jerry Ratzlaff on . Posted in Thermodynamics

The second law of thermodynamics (entropy) states that heat cannot pass from a cold body to a hot one by a self-acting process without the help of an external influence.  Entropy is the measure of disorder within a system. The more disorder within the system, energy becomes less available to do work.

### Second Law of Thermodynamics formula

$$\large{ \Delta S = \frac {\Delta Q} {T} }$$

Where:

$$\large{ \Delta S }$$ = entropy differential

$$\large{ \Delta Q }$$ = heat differential (energy)

$$\large{ T }$$ = temperature