A rubber ball of bulk modulus B is taken to a depth h of a liquid of densityρ . The magnitude of fractional change in radius of the ball is

The volumetric strainδvv=−ρB , Where p=ρgh  then - −δvv=pghB Since the volume of the sphere is v=43πr3 We have δvv=ρghB  using eqs( I ) and ( ii ) , we have δrr=ρgh3B