A ball at a depth of 200m in a tank is shown in figure below
Here, depth h=200m and percentage decrease in volume =0.1% As, pressure at depth h is given by p=ρgh where, g=9.8ms−2 and ρ=103kgm−3 So, p=103×9.8×200 ⇒p=19.6×105N∕m2 Now, the bulk modulus k=
p
ΔV
V
⇒k=
19.6×105
0.1
100
=1.96×109Nm−2 Hence, the bulk modulus of the material of ball is 1.96×109Nm−2