What is the difference in volume (due only to pressure changes, not temperature or other factors) between 1000 kg of water at the surface (assume 4 degrees C) of the ocean and the same mass at the deepest known depth, 8.00 km? (Mariand Trench; assume also 4 degrees C.)

Answer 1

The formula and the bulk modulus (E) value you need are given here:
http://www.engineeringtoolbox.com/bulk-modulus-elasticity-d_585.html

Use density and E values for sea water