HVACR Glossary
Inches of water
A unit of pressure equal to the pressure exerted by a column of liquid
water one inch high at sea level and at a temperature of 39.2°F. One inch of
water column equals a pressure of 0.578 ounce per square inch at sea level
and at a temperature of 39.2°F. One inch of water column equals a pressure
of 0.578 ounce per square inch(.036 psi). One inch of mercury column equals
about 13.6 inches of water column. Approximately 1/28 of one psi.
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