How many attobar in 1 inch of mercury?
The answer is 3.3863886666667E+16.

We assume you are converting between **attobar** and **inch of mercury [0 °C]**.

You can view more details on each measurement unit:

attobar or
inch of mercury

The SI derived unit for **pressure** is the pascal.

1 pascal is equal to 10000000000000 attobar, or 0.00029529983071445 inch of mercury.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between attobars and inches of mercury.

Type in your own numbers in the form to convert the units!

You can do the reverse unit conversion from inch of mercury to attobar, or enter any two units below:

attobar to barad

attobar to decitorr

attobar to centitorr

attobar to micropascal

attobar to micrometer of water

attobar to centihg

attobar to millitorr

attobar to zeptobar

attobar to microbar

attobar to kilopascal

The SI prefix "atto" represents a factor of
10^{-18}, or in exponential notation, 1E-18.

So 1 attobar = 10^{-18} 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, báros 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.

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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

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