<P> Inches of water, inches of water gauge (iwg or in. w.g.), inches water column (inch wc or just wc), inAq, Aq, or inH O is a non-SI unit for pressure . The units are conventionally used for measurement of certain pressure differentials such as 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 . </P> <P> It is defined as the pressure exerted by a column of water of 1 inch in height at defined conditions . At a temperature of 4 ° C (39.2 ° F) pure water has its highest density (1000 kg / m). At that temperature and assuming the standard acceleration of gravity, 1 inAq is approximately 249.082 pascals . </P> <P> Alternative standard conditions in uncommon usage are 60 ° F, or 68 ° F (20 ° C), and depends on industry standards rather than on international standards . </P>

One pascal is equal to how many inches of water column
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