Bulk Modulus of Fluids: Formula, Values & Calculator

Overview

The bulk modulus ($K$) measures a fluid's resistance to compression. A high bulk modulus means the fluid is nearly incompressible.

Variables

Symbol	Description	Unit
$K$	Bulk modulus	Pa
$V$	Volume	m³
$P$	Pressure	Pa
$\rho$	Density	kg/m³

Formula

$K = -V \frac{dP}{dV} = \rho \frac{dP}{d\rho}$

Calculator

Notes

• Results are approximate and should be verified for critical applications
• Input values should be within reasonable engineering ranges

Data Table

References

• Original Source