Back Polzada de mercuri Catalan Palec rtuťového sloupce Czech Zoll Quecksilber German Pulgada de mercurio Spanish اینچ جیوه Persian Pouce de mercure French पारे का इंच Hindi Inci raksa ID InHg Italian 水銀柱インチ Japanese
&lang=en&file=File:Question_book-new.svg){kind=small} | This article needs additional citations for verification. (May 2016) |
| Inch of mercury | |
|---|---|
&lang=en&file=File:Rare_American_Barometer,_Lyman_King,_Clifton_Springs,_New_York,_c._1860_-_Museum_of_Science_and_Industry_(Chicago)_-_DSC06342.JPG) Early American barometer calibrated in inches of mercury | |
| General information | |
| Unit of | Pressure |
| Symbol | inHg, ″Hg |
| Conversions | |
| 1 inHg in ... | ... is equal to ... |
| SI units | 3.38639 kPa |
| United States customary units | 0.491154 psi |
Inch of mercury (inHg and ″Hg) is a non-SI unit of measurement for pressure. It is used for barometric pressure in weather reports, refrigeration and aviation in the United States.
It is the pressure exerted by a column of mercury 1 inch (25.4 mm) in height at the standard acceleration of gravity. Conversion to metric units depends on the density of mercury, and hence its temperature; typical conversion factors are:[1]
| Conditions | Pressure |
|---|---|
| conventional | 3386.389 pascals |
| 32 °F (0 °C) | 3386.38 pascals |
| 60 °F (16 °C) | 3376.85 pascals |
In older literature, an "inch of mercury" is based on the height of a column of mercury at 60 °F (15.6 °C).[1]
- 1 inHg60 °F = 3,376.85 pascals (33.7685 hPa)
In Imperial units: 1 inHg60 °F = 0.489 771 psi, or 2.041 771 inHg60 °F = 1 psi.
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