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- Inch_of_mercury abstract "Inches of mercury, (inHg and "Hg) is a unit of measurement for pressure. It is still used for barometric pressure in weather reports, refrigeration and aviation in the United States.It is defined as the pressure exerted by a circular column of mercury of 1 inch in height at 32 °F (0 °C) at the standard acceleration of gravity.1 inHg = 3386.389 Pa at 0 °C.Aircraft altimeters measure the relative pressure difference between the lower ambient pressure at altitude and a calibrated reading on the ground. Within the U.S. and Canada, these readings are provided in inches of mercury. Ground readings vary with weather and along the route of the aircraft as it travels, so current readings are relayed periodically by air traffic control. 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 (1 atm = 29.92 inHg) or 1013.25 hPa (1 hPa = 1 mbar) regardless of the actual sea level pressure. The resulting altimeter readings are known as flight levels.Piston engine aircraft with constant-speed propellers also use inches of mercury to measure manifold pressure, which is indicative of engine power produced. In automobile racing, particularly USAC and CART Indy car racing, inches of mercury was the unit used to measure turbocharger inlet pressure. However, the inch of mercury is still used today in car performance modification to measure the amount of vacuum within the engine's intake manifold. This can be seen on boost/vacuum gauges.In air conditioning and refrigeration, inHg is often used to describe "inches of mercury vacuum", or pressures below 0 psig, for recovery of refrigerants from air conditioning and refrigeration systems, as well as for leak testing of systems while under a vacuum, and for dehydration of refrigeration systems. The low side gauge in a refrigeration gauge manifold indicates pressures below 0 psig in "inches of mercury vacuum" (inHg), down to a 30 inHg vacuum.In older literature, an "inch of mercury" is based on the height of a column of mercury at 60 °F (15.6 °C) 1 inHg60 °F = 3376.85 PaIn English units: 1 inHg = 0.491 098 psi, or 2.036 254 inHg = 1 psi.".
- Inch_of_mercury wikiPageID "2319766".
- Inch_of_mercury wikiPageRevisionID "600887700".
- Inch_of_mercury hasPhotoCollection Inch_of_mercury.
- Inch_of_mercury subject Category:Mercury_(element).
- Inch_of_mercury subject Category:Units_of_pressure.
- Inch_of_mercury type Abstraction100002137.
- Inch_of_mercury type DefiniteQuantity113576101.
- Inch_of_mercury type Measure100033615.
- Inch_of_mercury type UnitOfMeasurement113583724.
- Inch_of_mercury type UnitsOfPressure.
- Inch_of_mercury comment "Inches of mercury, (inHg and "Hg) is a unit of measurement for pressure.".
- Inch_of_mercury label "InHg".
- Inch_of_mercury label "Inch of mercury".
- Inch_of_mercury label "Дюйм ртутного столба".
- Inch_of_mercury label "水銀柱インチ".
- Inch_of_mercury label "英寸汞柱".
- Inch_of_mercury sameAs Palec_rtuťového_sloupce.
- Inch_of_mercury sameAs InHg.
- Inch_of_mercury sameAs 水銀柱インチ.
- Inch_of_mercury sameAs m.073jh4.
- Inch_of_mercury sameAs Q1050958.
- Inch_of_mercury sameAs Q1050958.
- Inch_of_mercury sameAs Inch_of_mercury.
- Inch_of_mercury wasDerivedFrom Inch_of_mercury?oldid=600887700.
- Inch_of_mercury isPrimaryTopicOf Inch_of_mercury.