Compressibility

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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

The isothermal compressibility, is given by

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

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

See also

The compressibility equation in statistical mechanics.