# Homework Help: Volume and Bulk Modulus

1. Jan 17, 2009

### Beginner@Phys

1. The problem statement, all variables and given/known data

Part A
What is the pressure at a depth of 5000 in the ocean? Given rho_water=1,030 kg/m^3
pTotal=p_0 + rho*g*h=5.06×107

Part B
What is the fractional volume change of seawater at this pressure? Given B=0.2*10^10
dV/v=p/-B =−2.53×10−2

Part C
What is the density of seawater at this pressure? (This is the question that I don't understand)

2. Relevant equations

(1)pTotal=p_0 + rho*g*h
(2)dV/v=p/-B
(3)p=F/A

3. The attempt at a solution
Part C: The liquid is incompressible. So. I guessed that the density of the liquid is still 1,030 kg/m^3 at a depth of 5,000m. And, I don't know why my answer was considered wrong.

2. Jan 17, 2009

### LowlyPion

You determined the volume change from the bulk modulus.

But what is density? weight/volume?

So what was occupying a m³ is now occupying less volume
... so isn't the density now greater since you can now squeeze more into a m³?