How many millimeter mercury in 1 millimeter of mercury?
The answer is 1.0000000193891.

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

You can view more details on each measurement unit:

millimeter mercury or
millimeter of mercury

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

1 pascal is equal to 0.0075006157584566 millimeter mercury, or 0.0075006156130264 millimeter of mercury.

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

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

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

1 millimeter mercury to millimeter of mercury = 1 millimeter of mercury

5 millimeter mercury to millimeter of mercury = 5 millimeter of mercury

10 millimeter mercury to millimeter of mercury = 10 millimeter of mercury

20 millimeter mercury to millimeter of mercury = 20 millimeter of mercury

30 millimeter mercury to millimeter of mercury = 30 millimeter of mercury

40 millimeter mercury to millimeter of mercury = 40 millimeter of mercury

50 millimeter mercury to millimeter of mercury = 50 millimeter of mercury

75 millimeter mercury to millimeter of mercury = 75 millimeter of mercury

100 millimeter mercury to millimeter of mercury = 100 millimeter of mercury

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

millimeter mercury to meter of air

millimeter mercury to micrometer of mercury

millimeter mercury to dekabar

millimeter mercury to micron of mercury

millimeter mercury to foot of mercury

millimeter mercury to micron mercury

millimeter mercury to dyne/square centimeter

millimeter mercury to inch water

millimeter mercury to newton/square meter

millimeter mercury to sthene/square meter

The millimeter of mercury by definition is 133.322387415 Pa (13.5951 g/cm3 × 9.80665 m/s2 × 1 mm), which is approximated with known accuracies of density of mercury and standard gravity.

The torr is defined as 1/760 of one standard atmosphere, while the atmosphere is defined as 101325 pascals. Therefore, 1 Torr is equal to

101325/760 Pa. The decimal form of this fraction is approximately 133.322368421.

The relationship between the torr and the millimeter of mercury is:

1 Torr = 0.999999857533699 mmHg

1 mmHg = 1.000000142466321 Torr

The difference between one millimeter of mercury and one torr, as well as between one atmosphere (101.325 kPa) and 760 mmHg (101.3250144354 kPa), is less than one part in seven million (or less than 0.000015%). This small difference is negligible for most applications outside metrology.

The torr (symbol: Torr) or millimetre of mercury (mmHg) is a non-SI unit of pressure. It is the atmospheric pressure that supports a column of mercury 1 millimetre high. The unit is named after Evangelista Torricelli, Italian physicist and mathematician, for his discovery of the principle of the barometer in 1643.

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