How is torr related to the S.I unit of quantity?

The torr is a pressure unit equal to 1.0 mm Hg. You have :1.0 standard atmosphere absolute = 101.325 kPa = 760 mm Hg = 760 torr.

It isn't. There is no unit of quantity in the SI system. Torr, historically was a unit of pressure, equal to one millimetre of mercury.

Equal nowadays to about 133.3 pascals.

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