Compressibility
The compressibility, , is given by
The bulk modulus gives the change in volume of a solid substance as the pressure on it is changed,
The compressibility 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.
Compressibility of an Ideal Gas
From the ideal gas law we see that