A torr is a physical unit of measure for pressure. The Torr is named after Italian scientist Evangelista Torricelli (1608-1647). One torr is defined as the pressure exerted by a one millimeter column of mercury:

1 torr = 1 mm Hg = 1/760 atm = 144.32 Pa

The torr is commonly used for measuring very low pressures (vacuum science).

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