Millimeters of water
- mm H2O
- mm WC
- mm of water is most commonly used to describe how much water clothes and tents can withstand without leaking
- mm of mercury is commonly used worldwide, particularly in medicine (to measure bloody pressure, etc.) and meteorology
1 mm of water is the pressure exerted by a 1 mm high column of water
Mostly used for describing water resistance of clothes and tents.