Definition:
Bulk modulus is defined as the ratio of volume stress to volume strain.
It is denoted by ‘K’.
Unit: N/m2 or Pa in SI system
Dimensions: [L-1M1T-2]
Expression for bulk modulus:
(i) If a sphere made from rubber is completely immersed in a liquid, it will be uniformly compressed from all sides.
Let, F = Compressive force,
dP = Change in pressure,
dV = Change in volume,
V = Original volume.
(ii) Volume stress = \(\frac{|\overrightarrow{F}|}{A}\) = dP
(iii) The negative sign indicates that there is a decrease in volume.
The magnitude of the volume strain is \(\frac{dV}{V}\)
