Torr

Traditional unit of pressure

The torr (symbol: Torr) is a unit of pressure based on an absolute scale, defined as exactly ⁠1/760⁠ of a standard atmosphere (101325 Pa). Thus one torr is exactly ⁠101325/760⁠ pascals (≈ 133.32 Pa). Historically, one torr was intended to be the same as one "millimetre of mercury", but subsequent redefinitions of the two units made the torr marginally lower (by less than 0.000015%).

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