Torr is a unit of measurement for pressure or vacuum. It is named after Evangelista Torricelli, an Italian physicist and mathematician who invented the barometer in 1643. The Torr is defined as 1/760th of the standard atmospheric pressure at sea level, which is approximately 101,325 Pascals or 1,013.25 millibars.
The Torr is commonly used in vacuum technology, where it is used to measure the degree of vacuum in a system. It is also used in the field of gas analysis and is commonly used to express partial pressures of gases in mixtures.
To convert Torr to other units of pressure, such as Pascals or atmospheres, a conversion factor can be used. One Torr is equal to 1/760th of an atmosphere or 133.3224 Pascals.
In recent years, the Torr has been largely replaced by the SI unit of pressure, the Pascal. However, it is still widely used in certain applications, particularly in the field of vacuum technology.