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torr

(unit of pressure approximating a millimeter of mercury on Earth)

A torr is a unit of pressure defined as 1/760 of an atm. It was originally defined as, and is meant to approximate the pressure associated with 1 millimeter of the mercury column in a mercury barometer. Torr is not an SI unit but is based on one. Note: the word for the unit is torr (non-capitalized), but the symbol is Torr (capitalized), so 1/1000 of it can be written as a millitorr, with the associated symbol, mTorr.


(physics,unit,pressure)
Further reading:
https://en.wikipedia.org/wiki/Torr
https://en.wiktionary.org/wiki/torr
http://www.ilpi.com/msds/ref/pressureunits.html
https://www.convertworld.com/en/pressure/torr.html

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