Millimeter of Water (mmH2O, mm WC, mm CE, mm WS)
Millimeter of Water (mmH2O, mm WC, mm CE, mm WS) :
A unit of pressure equal to the pressure exerted at the Earth's surface by a column of water 1 millimeter high. This is a small pressure, about 9.8067 pascals, 0.098 067 millibars, 0.03937 inch of water, or 0.204 pounds per square foot. The French symbol is mm CE (colonne d'eau), and the German symbol is mm WS (Wassers ule)
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