Bulk modulus

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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:

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

In terms of VP and VS

We can express the modulus in terms of acoustic velocity:[1]

See also

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Bulk modulus
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  1. Mavko, G, T Mukerji, and J Dvorkin (2009). 'The Rock Physics Handbook', 2nd edition. Cambridge.