continue to be used in areas as diverse as weather reporting and scuba diving.

Conversion factors

The millimetre 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 of one standard atmosphere, while the atmosphere is defined as 101325 pascals. Therefore, 1 Torr is equal to Pa. The decimal form of this fraction

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