For the suction device, see mercury vacuum. A mercury vacuum is a Vacuum cleaner specifically designed to collect mercury, for instance to clean up spills of the element

Inches of mercury, inHg or "Hg is a measuring unit for pressure. Pressure (symbol 'p' is the force per unit Area applied to an object in a direction perpendicular to the surface It is still widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere. The weather is a set of all the phenomena occurring in a given Atmosphere at a given Time. Aviation refers to activities involving man-made flying devices ( Aircraft) including the people organizations and regulatory bodies involved with them The United States of America —commonly referred to as the

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. Mercury (ˈmɜrkjʊri also called quicksilver or hydrargyrum, is a Chemical element with the symbol Hg ( Latinized hydrargyrum Inches redirects here To see the Les Savy Fav album see Inches. Height is the measurement of vertical Distance, but has two meanings in common use The Celsius Temperature scale was previously known as the centigrade scale. Standard gravity, usually denoted by g 0 or g n is the nominal acceleration due to gravity at the Earth's surface at sea level

1 inHg = 3,386. 389 pascals at 0 °C.

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. A Flight Level ( FL) is a standard nominal Altitude of an Aircraft, in hundreds of Feet. An altimeter is an instrument used to measure the Altitude of an object above a fixed level 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. The bar (symbol bar) decibar (symbol dbar) and the millibar (symbol mbar, also mb are units of Pressure. S. and Canada. The resulting altimeter readings are known as flight levels. A Flight Level ( FL) is a standard nominal Altitude of an Aircraft, in hundreds of Feet.

Piston engine aircraft with constant-speed propellers also use inches of mercury to measure manifold pressure, which is indicative of engine power produced. A reciprocating engine, also often known as a piston engine, is a Heat engine that uses one or more reciprocating Pistons to convert A Constant speed Propeller is a type of propeller that can change its blade pitch to take better advantage of the power supplied by an engine in much the same way that a transmission Manifold vacuum, or engine Vacuum in an internal combustion engine is the difference in air pressure between the engine's intake manifold and

In older literature, an inch of mercury based on the height of a column at 60 °F (15. 6 °C) was common. ^[1]

1 inHg_{60 °F} = 3,376. 85 Pa

See also

• Torr (millimeters of mercury)
• Bar (unit)
• Mercury-in-glass thermometer, a thermometer having the element of mercury in a glass tube

References

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