# Thermodynamic probability

From Glossary of Meteorology

## thermodynamic probability

Proportional to the number of equally likely states that a system may attain.

Boltzmann proposed that the entropy

*S*and the thermodynamic probability*W*were proportional, and Planck subsequently showed that*S*=*k*ln*W*with*k*Boltzmann's constant. This result is of such fundamental significance in physics that it was carved as an adornment on Boltzmann's gravestone in Vienna.*See*third law of thermodynamics.