Question

Which of the following represents volumetric strain?

(a) -ΔV/V

(b) ΔV/V

(c) Pressure/Volume

(d) -P / (ΔV/V)

I got this question in an interview.

The question is from Solids Mechanical Properties in portion Mechanical Properties of Solids of Physics – Class 11

Answer 1

Right choice is (b) ΔV/V

To explain I would say: The volumetric strain is defined as ratio of change in volume to original volume. It can be either positive or negative. The option -P / (ΔV/V) is the bulk modulus which is basically the ratio of volumetric stress to volumetric strain.