›› Convert to gigapascal


inch mercury
gigapascal


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How many inch mercury in 1 gigapascal? The answer is 295299.80164712.
We assume you are converting between and gigapascal.
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inch mercury or gigapascal
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.00029529980164712 inch mercury, or 1.0E-9 gigapascal.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between inches mercury and gigapascals.
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›› Common pressure conversions

inch mercury to femtobar
inch mercury to pound/square inch
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inch mercury to centipascal


›› Definition: Inch 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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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: Gigapascal

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

So 1 gigapascal = 109 pascals.

The definition of a pascal is as follows:

The pascal (symbol Pa) is the SI unit of pressure.It is equivalent to one newton per square metre. The unit is named after Blaise Pascal, the eminent French mathematician, physicist and philosopher.


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