Inch of water

Inches of water, wc, inch water column (inch WC), inAq, Aq, or in H2O is a non-SI unit for pressure. The units are by convention and due to the historical measurement of certain pressure differentials. It is used for measuring small pressure differences across an orifice, or in a pipeline or shaft. Inches of water can be converted to a pressure unit using the formula for pressure head. An inch of water column (iwc) is synonymous with an inch of water gauge (iwg). 1 inAq ≈ .036 psi, or 27.7 inAq ≈ 1 psi.

Inch of water

Inches of water, wc, inch water column (inch WC), inAq, Aq, or in H2O is a non-SI unit for pressure. The units are by convention and due to the historical measurement of certain pressure differentials. It is used for measuring small pressure differences across an orifice, or in a pipeline or shaft. Inches of water can be converted to a pressure unit using the formula for pressure head. An inch of water column (iwc) is synonymous with an inch of water gauge (iwg). 1 inAq ≈ .036 psi, or 27.7 inAq ≈ 1 psi.