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Results for Inch of mercury
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(mechanics) The pressure exerted by a 1-inch-high (2.54-centimeter) column of mercury that has a density of 13.5951 grams per cubic centimeter when the acceleration of gravity has the standard value of 9.80665 m/s2 or approximately 32.17398 ft/s2; equal to 3386.388640341 pascals; used as a unit in the measurement of atmospheric pressure.
To convert from inches of mercury to:
atmospheres,
multiply by .03342.
feet of water,
multiply by 1.133.
kgs/sq. cm,
multiply by .03453.
kgs/sq. meter,
multiply by 345.3.
pounds/sq. ft.,
multiply by 70.73.
pounds/sq. in.,
multiply by .4912.
Inches of mercury, inHg or "Hg is a non-SI unit for pressure. It is still widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.
It is defined as the pressure exerted by a column of mercury of 1 inch in height at 32 °F (0 °C) at the standard acceleration of gravity.
Aircraft operating at higher altitudes (at or above what is called the Transition Altitude, which varies by country) set their barometric altimeters to a standard pressure of 29.92 inHg or 1,013.2 hPa (1 hPa = 1 mbar) regardless of the actual sea level pressure, with inches of mercury used in the U.S. and Canada. The resulting altimeter readings are known as flight levels.
Piston engine aircraft with constant-speed propellers also use inHg to measure manifold pressure, which is indicative of engine power produced.
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 | Sci-Tech Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Inch of mercury". Read more |
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