Entropy

The entropy, S, is given by

$S=k_{B}\ln \Omega$

where Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle k_B} is the Boltzmann constant and Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \Omega} (sometimes written as $W$) is the number of microscopic configurations that result in the observed macroscopic description of the thermodynamic system.

See also:

• Entropy of a glass
• Shannon entropy
• Tsallis entropy