# Bulk modulus - Ratio of compressive stress to volumetric strain- Fluid Mechanics

Q.  Bulk modulus is the ratio of
- Published on 05 Aug 15

a. shear stress to volumetric strain
b. volumetric strain to shear stress
c. compressive stress to volumetric strain
d. volumetric strain to compressive stress

ANSWER: compressive stress to volumetric strain

#### Discussion

• Satyawati   -Posted on 25 Sep 15
The bulk modulus is a measure of compressibility of a fluid. It is the ratio of compressive stress to volumetric strain. As compressibility of a fluid is expressed as inverse of bulk modulus, higher the bulk modulus less is the compressibility of the fluid.
Generally, liquids are considered as incompressible fluids. But it can be compressed upto 5% of its volume when very high pressure of above 100,000 kPa is applied.
Bulk modulus can be expressed as,

K = (Increase in pressure) / (Volumetric strain)

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