Calculate the pressure at a depth of 2 miles below the surface of the ocean. Explain and justify any assumptions you make. The physical principle that applies to this problem can be described by the equation

\[\Phi=\text { constant }\]

where

\[\Phi=P+ho g z\]

$z$ is the vertical distance measured upward from any horizontal reference plane

Express your answer in units of (a) atm, (b) psi, (c) $\mathrm{Pa}$, (d) poundal $/ \mathrm{ft}^{2}$, (e) dyn $/ \mathrm{cm}^{2}$, (f) $\mathrm{kg}_{\mathrm{f}} / \mathrm{m}^{2}$, (g) $\mathrm{N} / \mathrm{m}^{2}$.