Convert millimeters of mercury to bars

Explanation

From this page you can convert millimeters of mercury to bars (or mmHg to bar) simply, by using the application above.

In case you are wondering, to convert from millimeters of mercury to bars you need to multiply by 0.001333. This factor is calculated using the respective definitions of the two units you can find below.

Formula

1 mmHg≈0.001333 bar

millimeters of mercurymmHg

dimension	pressure
symbol	mmHg

The conventional millimeter of mercury (mmHg) is a unit of pressure.

Definition of the millimeter of mercury

The conventional millimeter of mercury is defined using a value for the density of mercury of 13595.1 kg/m³ and the standard gravity.

Value in terms of the SI

One millimeter of mercury is 133.3224 pascals. This is an approximation.

NIST Guide to the SI, Appendix B.9

History

The most simple barometer is made of a vertical glass tube from which all air as been removed, with a sealed top and an open base submerged into mercury. The atmospheric pressure then pushes the mercury up the tube until it equalize with the pressure at the base of the column of mercury.

The pressure is then expressed as the height of the column of mercury in millimeters.

The measure is dependent on the temperature and local gravity. To ease conversion between units, the millimeter of mercury has been defined with these parameters respectively fixed to approximately 0 °C and exactly 9.80665 m/s².

barsbar

dimension	pressure
symbol	bar

The bar (bar) is a metric unit of pressure not part of the SI.

The unit is most prominently used in meteorology to express atmospheric air pressure with values generally in millibars.

One bar is roughly equal to the average atmospheric pressure at sea level on Earth.

Definition of the bar

One bar is equal to 100000 pascals.

The International System of Units 8^th edition p. 127

Equivalences

One bar is equivalent to:

Some Facts

The atmospheric pressure at the surface of Venus is 92 bars, at this pressure the boiling point of water is more than 300 °C (or 572 ° F). Teatime must be quite peculiar on Venus.

millibar	mbar	0.001
centibar	cbar	0.01
decibar	dbar	0.1
bar	bar	1
decabar	dabar	10
hectobar	hbar	100
kilobar	kbar	1000
megabar	Mbar	1 000 000

millimeter of mercury	mmHg	1
centimeter of mercury	cmHg	10
centimeter of mercury at 0 °C	-