›› Convert inch of mercury [0 C] to gigabar


inch of mercury
gigabar

›› More information from the unit converter

How many inch of mercury in 1 gigabar? The answer is 29529983071.445.
We assume you are converting between inch of mercury [0 C] and gigabar.
You can view more details on each measurement unit:
inch of mercury or gigabar
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.00029529983071445 inch of mercury, or 1.0E-14 gigabar.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between inches of mercury and gigabars.
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›› Common pressure conversions

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›› Definition: Inch of mercury

Inches of mercury or inHg 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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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.

1 inHg = 3,386.389 pascals at 0 C.

Aircraft operating at higher altitudes (above 18,000 feet) 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.


›› Definition: Gigabar

The SI prefix "giga" represents a factor of 109, or in exponential notation, 1E9.

So 1 gigabar = 109 bars.

The definition of a bar is as follows:

The bar is a measurement unit of pressure, equal to 1,000,000 dynes per square centimetre (baryes), or 100,000 newtons per square metre (pascals). The word bar is of Greek origin, bros meaning weight. Its official symbol is "bar"; the earlier "b" is now deprecated, but still often seen especially as "mb" rather than the proper "mbar" for millibars.


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