The value of hydrostatic pressure for a fixed height column of fluid is directly proportional to the gravitational strength at a particular geographical location.
Generally if the height above sea level is increased the hydrostatic pressure will decrease. Also since the world is wider at the equator than the poles the gravitational pull will increase as you move closer to either the north or south pole.
For example, the acceleration due to gravity in Bangkok, Thailand is 9.783 m/s², whereas in London, England it is 9.812m/s². This represents a difference of approx 0.3%, therefore a column of water that has a hydrostatic pressure of 1000 mmWG in Bangkok will measure 1003 mmH20 in London, England even though the water level has not changed between the two locations.
In order to standardise the measurement of hydrostatic pressure the universal value for Earth’s gravity of 9.80665 m/s² is used.
This local gravity calculator will provide you with a good approximation of the local gravity at your location.
Featured hydrostatic pressure measurement products
Underground rain water storage tank level sensor and readout for 2 metre depth - Water level indicator for a 2 metre deep rain water storage tank located underground. 
Underwater Pressure Sensors - Explore IP68-rated underwater pressure sensors designed for continuous submersion. Ideal for ballast tank level, subsea system monitoring, and hollow structure flood detection.
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Related Technical Terms
- cmH2O – Centimetres of Water Column at 4 deg C Pressure Unit
- ftH2O – Feet of Water Column at 4 deg C Pressure Unit
- mH2O – Metres of Water Gauge at 4 deg C Pressure Unit
- mmH2O – Millimetres of Water Column at 4 deg C Pressure Unit
- Specific Gravity
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