Related Resources: fluid flow

Bulk Modulus of Elasticity

Bulk Modulus of Elasticity (E)

The bulk modulus of elasticity (E) expresses the compressibility of a fluid. It is the ratio of the change in unit pressure to the corresponding volume change per unit of volume.

${\displaystyle E=\frac{dp}{-<!--\; -\; -->dv/v}}$

Because a pressure increase, d p, results in a decrease in fractional volume, dv/v, the minus is inserted to render E positive. Clearly, the units of E are those of pressure - Pa or lb/in².

Bulk modulus

Source:

Schaum's Outline of Fluid Mechanics and Hydraulics

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