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The bulk modulus B gives the change in volume of a solid substance as the pressure on it is changed,

The compressibility K or , is given by

Isothermal compressibility[edit]

The isothermal compressibility, is given by

(Note: in Hansen and McDonald the isothermal compressibility is written as ). where is the temperature, is the particle number density given by

where is the total number of particles in the system, i.e.

Adiabatic compressibility[edit]

The adiabatic compressibility, is given by

where is the entropy.

See also[edit]

The compressibility equation in statistical mechanics.