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atmosphere [standard] atmosphere [technical] |

How many mmHg in 1 atm?
The answer is 759.999951996.

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

You can view more details on each measurement unit:

mmHg or
atm

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

1 pascal is equal to 0.00750061561303 mmHg, or 9.86923169314E-6 atm.

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

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

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

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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