Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Hydrostatic Pressure vs. Depth

Sponsored Links

Hydrostatic pressure in a liquid can be calculated as

p = ρ g h                         (1)

where

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 vs. Water Depth
Height of Water ColumnPressure
(m)(ft)(kPa)(bar)(atm)(psi)
1 3.28 9.81 0.098 0.097 1.42
2 6.56 19.6 0.196 0.194 2.85
3 9.84 29.4 0.294 0.290 4.27
4 13.1 39.2 0.392 0.387 5.69
5 16.4 49.1 0.491 0.484 7.11
6 19.7 58.9 0.589 0.581 8.54
7 23.0 68.7 0.687 0.678 10.0
8 26.2 78.5 0.785 0.775 11.4
9 29.5 88.3 0.883 0.871 12.8
10 32.8 98.1 0.981 0.968 14.2
12 39.4 118 1.18 1.16 17.1
14 45.9 137 1.37 1.36 19.9
16 52.5 157 1.57 1.55 22.8
18 59.0 177 1.77 1.74 25.6
20 65.6 196 1.96 1.94 28.5
25 82.0 245 2.45 2.42 35.6
30 98.4 294 2.94 2.90 42.7
35 115 343 3.43 3.39 49.8
40 131 392 3.92 3.87 56.9
50 164 491 4.91 4.84 71.1
60 197 589 5.89 5.81 85.4
70 230 687 6.87 6.78 100
80 262 785 7.85 7.75 114
90 295 883 8.83 8.71 128
100 328 981 9.81 9.68 142

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)

Ocean Pressure - Depth and Latitude

Ocean pressure varies with depth and position (latitude) on earth.

Ocean Pressure vs. Depth and Latitude

Depth
(m)		Ocean Pressure (MPa)
Latitude (degrees)
0153045607590
0 0 0 0 0 0 0 0
1000 10.080 10.083 10.093 10.106 10.120 10.130 10.133
2000 20.208 20.215 20.234 20.261 20.288 20.308 20.315
3000 30.383 30.394 30.424 30.464 30.505 30.535 30.545
4000 40.606 40.620 40.660 40.714 40.768 40.808 40.823
5000 50.874 50.892 50.942 51.010 51.079 51.129 51.147
6000 61.188 61.210 61.270 61.352 61.434 61.495 61.517
7000 71.547 71.572 71.643 71.739 71.835 71.906 71.932
8000 81.949 81.979 82.059 82.170 82.280 82.361 82.391
9000 92.395 92.428 92.519 92.644 92.769 92.861 92.894
10000 102.880 102.917 103.019 103.157 103.296 103.398 103.436
  • 1 Pa = 10-6 MPa = 10-3 kPa = 10-6 N/mm2 = 10-5 bar = 0.1020 kp/m2 = 1.020x10-4 m H2O at 4°C/39°F = 9.869x10-6 atm = 0.004 in H2O= 1.450x10-4 psi (lbf/in2) = 0.02089 lbf/ft2 (psf)
Sponsored Links

Related Topics

• Fluid Mechanics

The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.

Related Documents

Archimedes' Law

Forces acting on bodies submerged in fluids.

Buoyancy

Buoyancy is the resultant force acting on a submerged body.

Hydraulic Force vs. Pascal's Law

Pascal's law and the hydraulic force acting in fluids.

Hydraulic Force vs. Pressure and Cylinder Size

Calculate hydraulic cylinder force.

Hydrostatic Force acting on Submerged Surface

Calculate the thrust force acting on a submerged surface.

Pressure

Introduction to pressure - online pressure units converter.

Pressure Gradient Diagrams

Static pressure graphical presentation throughout a fluid flow system.

Pressure Units - Online Converter

Convert between pressure units like Pa,  bar, atmosphere, pound square feet, psi and more.

Pumps - Head vs. Pressure

Converting head (ft or m) to pressure (psi or bar, kg/cm2) and vice versa.

Static Pressure vs. Head

Static pressure vs. pressure head in fluids.

Underground Pipes - Earth Pressure

Pressure acting on underground pipes due to weight of soil and transport.

Velocity-Area Flowmetering

Flow rate or discharge in an open conduit, channel or river can be calculated with the velocity-area principle.

Water - Density, Specific Weight and Thermal Expansion Coefficients

Definitions, online calculator and figures and tables with water properties like density, specific weight and thermal expansion coefficient of liquid water at temperatures ranging 0 to 360°C (32 to 680°F).

Water Pressure vs. Head

Pressure in pounds per square inch (psi) vs. head in feet of water (fth2o).

Sponsored Links

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.