# Difference between revisions of "Pressure"

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*[[Pressure equation]] | *[[Pressure equation]] | ||

*[[Virial pressure]] | *[[Virial pressure]] | ||

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[[category: statistical mechanics]] | [[category: statistical mechanics]] | ||

[[category: classical thermodynamics]] | [[category: classical thermodynamics]] |

## Revision as of 10:43, 7 February 2008

**Pressure** () is the force per unit area applied on a surface, in a direction perpendicular to that surface, i.e. the scalar part of the stress tensor. The SI units for pressure are Pascals (Pa).
In thermodynamics the pressure is given by

where is the Helmholtz energy function, is the volume, is the Boltzmann constant, is the temperature and is the canonical ensemble partition function.