torr

torr (tor)

A unit of pressure sufficient to support a 1-mm column of mercury at 0°C against the standard acceleration of gravity at 45° north latitude (980.621 cm/sec²); equivalent to 1333.224 dynes/cm², 1.333224 millibars, 1.35951 cm H₂O, 133.3224 newtons/m² (or Pa); one standard atmosphere equals 760 t. [Evangelista Torricelli,]

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