KnowraTorrTorrThe torr is a unit of pressure equal to exactly 1/760 of a standard atmosphere, approximately 133.322 pascals.BriefConnectPressure: Pressure is force distributed over a unit of area. The torr measures pressure, expressing force per area on a particular scale.Vacuum engineering: Vacuum engineering designs and operates systems that maintain pressures below ambient atmospheric pressure. Torr and its multiples commonly specify vacuum levels and equipment limits.Evangelista Torricelli: Evangelista Torricelli was an Italian physicist who demonstrated atmospheric pressure using a mercury barometer. The torr is named after Torricelli, whose barometer linked pressure to mercury-column height.Millitorr: A millitorr is one-thousandth of a torr, equal to approximately 0.133322 pascals. It is used when vacuum pressures are too small to express conveniently in torr.Pascal (unit): The pascal is the SI unit of pressure, equal to one newton per square metre. The torr’s SI equivalent is approximately 133.322 pascals.Vacuum pump: A vacuum pump removes gas from a sealed volume to reduce its pressure. Pump performance and attainable vacuum are often reported in torr.Mercury barometer: A mercury barometer measures atmospheric pressure by the height of mercury supported in a column. Its traditional readings in millimetres of mercury provided the historical model for the torr.Inch of mercury: The inch of mercury is a pressure unit based on the height of a mercury column one inch tall. It is another barometric unit, especially common in aviation and weather reporting.Standard atmosphere: The standard atmosphere is a pressure unit defined as exactly 101,325 pascals. One standard atmosphere is defined as exactly 760 torr.Vacuum gauge: A vacuum gauge measures pressure below or near atmospheric pressure. Many gauges display low pressures in torr or millitorr.Show all 22Linked from 4 pagesAbsolute pressureRelated: Torr is commonly used to express low absolute pressures in vacuum systems.Show all 4