Bulk modulus

The bulk modulus (K) of a fluid, gas or solid denotes the resistance to change of the material when a uniform pressure is applied. It is given by the ratio of volume stress to volume strain:

$K={\frac {P}{\Delta V/V}}$

with P being pressure and V being volume. The delta (Δ) represents change.

In terms of V_P and V_S

We can express the modulus in terms of acoustic velocity:

$K=\rho \left(V_{\mathrm {P} }^{2}-{\frac {4}{3}}V_{\mathrm {S} }^{2}\right)$

See also

• Elastic modulus
• Shear modulus

External links

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