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How many mm of mercury 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:

mm of mercury or
atm

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

1 pascal is equal to 0.00750061561303 mm of mercury, 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.

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

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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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