The pressure in the atmosphere decreases exponentially with height ly). in this problem, we will investigate the dependence of pressure on depth in the ocean a) use the hydrostatic relation to derive an expression for pressure as a function of depth in the ocean. assume the density of sea water is a constant equal to 1000 kg -3 b) calculate the depth in the ocean where the pressure is double that at the surface (ie the depth at which the water column above contributes roughly 1 atmosphere of pressure).