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**Change in density of water......**

## Homework Statement

Calculate the approximate change in density of water in a lake at a depth of 400m below the surface. The density of water at the surface is 1030kg/m

^{3}and bulk modulus(B) of water is 2*10

^{9}.....

## Homework Equations

rho=rho

_{0}(1/(1-dP/B))

rho = density of water at any depth

rho

_{0}= density of water at surface

dP= change in pressure

## The Attempt at a Solution

How to calculate dP if i use h*rho*g , rho is not constant.....So how do i go about it.....Please help.....