Second Law of Thermodynamics

Written by Jerry Ratzlaff. 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.


\( \Delta s = \frac {\Delta Q} {T}   \)


\(\Delta s\) = entropy differential

\(\Delta Q\) = heat differential (energy)

\(T\) = temperature