# Hydrostatic Pressure

## Depth and hydrostatic pressure

Hydrostatic pressure in a liquid can be calculated using the following equation:

p = ρ g h                         (1)

where

p = pressure in fluid (N/m2, Pa, lbf/ft2, psf)

ρ = density of liquid (kg/m3, slugs/ft3)

g = acceleration of gravity (9.81 m/s2, 32.17405 ft/s2)

h = height of fluid column, or depth in the fluid at which the pressure is measured (m, ft)

Hydrostatic pressure in a water column (density 1000 kg/m3) - or depth:

### Example - Pressure acting in water at depth 1 m

The density of water at 4oC is 1000 kg/m3. The pressure acting in water at 1 m can be calculated as

p = ρ g h

= (1000 kg/m3) (9.81 m/s2) (1 m)

= 9810 Pa

### Example - Pressure acting in water at depth 3 ft

The density of water at 32oF is 1.940 slugs/ft3. The pressure acting in water at 3 ft can be calculated as

p = ρ g h

= (1.940 slugs/ft3) (32.17405 ft/s2) (3 ft)

= 187.3 lbf/ft2 (psf)

= 1.3 lbf/in2 (psi)

## Related Topics

• Fluid Mechanics - The study of fluids - liquids and gases. Involves velocity, pressure, density and temperature as functions of space and time

## Tag Search

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