›› Convert to zeptobar

inch mercury

›› More information from the unit converter

How many inch mercury in 1 zeptobar? The answer is 2.9529980164712E-20.
We assume you are converting between and zeptobar.
You can view more details on each measurement unit:
inch mercury or zeptobar
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.00029529980164712 inch mercury, or 1.0E+16 zeptobar.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between inches mercury and zeptobars.
Type in your own numbers in the form to convert the units!

›› Quick conversion chart of inch mercury to zeptobar

1 inch mercury to zeptobar = 3.386389E+19 zeptobar

2 inch mercury to zeptobar = 6.772778E+19 zeptobar

3 inch mercury to zeptobar = 1.0159167E+20 zeptobar

4 inch mercury to zeptobar = 1.3545556E+20 zeptobar

5 inch mercury to zeptobar = 1.6931945E+20 zeptobar

6 inch mercury to zeptobar = 2.0318334E+20 zeptobar

7 inch mercury to zeptobar = 2.3704723E+20 zeptobar

8 inch mercury to zeptobar = 2.7091112E+20 zeptobar

9 inch mercury to zeptobar = 3.0477501E+20 zeptobar

10 inch mercury to zeptobar = 3.386389E+20 zeptobar

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

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›› Common pressure conversions

inch mercury to millitorr
inch mercury to pieze
inch mercury to pascal
inch mercury to inch water
inch mercury to kilogram-force/square millimeter
inch mercury to exapascal
inch mercury to yottabar
inch mercury to centimeter water
inch mercury to barye
inch mercury to kilopascal

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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

The SI prefix "zepto" represents a factor of 10-21, or in exponential notation, 1E-21.

So 1 zeptobar = 10-21 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.

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