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Hydrostatic Pressure

Depth and hydrostatic pressure

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hydrostatic pressure

Hydrostatic pressure in a liquid can be calculated as

p = ρ g h                         (1)


p = pressure in liquid (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 where pressure is measured (m, ft)

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

hydrostatic pressure water kPa Pa bar psi meter feet

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)

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  • es: agua de la presión hidrostática bar psi estática kPa Pa pies metros
  • de: hydrostatische Druckwasser statische psi bar kPa Pa Meter Fuß
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