Foot of Head (ft hd)
Foot of Head (ft hd) : A traditional unit of water pressure used in plumbing and hydraulics. "Head" is short for "headwaters"; it refers to the depth of the water upstream from the point at which the pressure is measured. One foot of head is equivalent to a pressure of 0.433 lb/in2, 2.989 kilopascals?(kPa), 29.89?millibars?(mb), or 0.882 inches of mercury (in Hg)
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