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Inch of water (inH2O - Water), pressure
Because pressure is commonly measured by its ability to displace a column of liquid in a manometer, pressures are often expressed as a depth of a particular fluid (e.g. inches of water). The most common choices are mercury (Hg) and water; water is nontoxic and readily available, while mercury's density allows for a shorter column (and so a smaller manometer) to measure a given pressure.
1 inH2O
is equal to
5.2 psf
Metric
-
2.49×10-4
-
2.49×10-3
-
2.54×10-3
-
0.25
-
2.49
-
2.49
-
25.4
-
249.08
Avoirdupois (U.S.)
Water
Atmosphere
-
2.46×10-3
-
2.54×10-3
Mercury
-
0.07
-
0.19
-
1.87
-
1.87