Torr 1
Torr 1 :
A non-metric unit of pressure equal to exactly 1/760 atmosphere, about 1.333 22 millibars, 133.322 pascals, or 0.019 337 pound per square inch (psi). The pressure of 1 atmosphere is almost exactly equivalent to the pressure of a column of 760 millimeters of mercury in a mercury barometer. As a result, 1 torr is the same thing as 1 mmHg within 1 part per million. In engineering, the pressures of near-vacuums are often stated in torr. The unit is named for Evangelista Torricelli (1608-1647), the Italian scientist who invented the barometer
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