Units of measurement
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Millimeters of water (mmH2O)
Inches of mercury (inHg)
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Millimeters of water (mmH2O)
Millimeters of water (mmH2O) — a unit of pressure equal to the pressure exerted by a 1-millimeter high column of water. Used in hydrostatics and water systems.
Inches of mercury (inHg)
Inches of mercury (inHg) — a unit of pressure equal to the pressure exerted by a 1-inch high column of mercury. Used for measuring air pressure and in aviation.