KnowraTorrLinked fromLinked fromThe 4 pages that link to Torr, each with the reason it gives.All 4Related 2Compared with 2Pascal (unit)Compared with: It is common in vacuum technology, where pascal values can be very small.Millimetre of mercuryCompared with: Torr is used in vacuum measurements and closely approximates, but is not identical to, mmHg.