Pressure and Depth
Pressure is measured in newtons per square meters, N / m2; this is known as a pascal, Pa.
1 pascal = 1 Pa = 1 [ N / m2 ]
The force exerted is independent of the direction.
Now consider the pressure Ph at some depth h beneath the surface of a liquid:
Look at the forces on a column of the liquid -- that column has a cross section area A and a height of h.
(c) 2005, Doug Davis; all rights reserved