The density of fresh water at a temperature of approximately 4 degrees Celsius is 1000 kg/m3.
Although the density of water varies with temperature, the density at 4degC is most commonly used because it is straightforward to remember and happens to be the temperature at which water is most dense.
The density of water is used in the calculation of pressure units which are based on the height of water columns such as meters of water (mH2O).
The density of water is used as a reference density for calculating the specific gravity of different types of liquids.
A pressure sensing device scaled in height of water pressure units can be used to measure the height of any liquid if the specific gravity is known for the specified fluid.
Featured hydrostatic liquid level sensor products
LMK458 Marine Approved Hydrostatic Level Transmitter - Marine approved level transmitter with 4-20mA output for measuring level of contents inside ship ballast, fuel, liquid cargo or wastewater tanks
Hydrostatic Level Sensors - Hydrostatic pressure sensing devices for measuring liquid level and converting it to an electrical signal to send to other instrumentation.