The bulk modulus measures the elastic response to hydrostatic pressure.

The modulus of elasticity for a material subjected to compression on all surfacesâ€”that is, volume stress. Bulk modulus is the relationship of volume stress to volume strain, expressed as the ratio between / and dV/Vo, wheredV is the change in volume and Vo is the original volume.

the ratio of pressure to the resulting compressional strain.

Is an elastic constant relating mean stress to volumetric strain.

the ratio of the change in pressure acting on a volume to the fractional change in volume

the measure of a fluid's resistance to compressibility.

The ratio of hydrostatic pressure to the relative change it produces in volume.

A ratio of normal stress to a change in volume. A term used in determining the compressibility of a fluid. Data for petroleum products can be found in the International Critical Tables.

A modulus of elasticity, relating change in volume to the hydrostatic state of stress. It is the reciprocal of compressibility.

The ratio of a change in applied mean normal effective stress to the resulting change in volumetric strain. Units: kPa

The bulk modulus (K) is the change of a substance's relative volume in response to changes in pressure. It essentially measures the substance's resistance to uniform compression.