Provisional international standard term to replace the English term millimeter of mercury and its abbreviation mm of Hg (or the French mm de Hg ) The torr is defined as 1/760 of a standard atmosphere or 1,013,250/760 dynes per square centimeter This is equivalent to defining the torr as 1333 22 microbars and differs by only one part in 7 million form the International Standard millimeter of mercury The prefixes milli and micro are attached without hyphenation
A unit of pressure that is equal to approximately 1.316·10[-3] atmosphere or 133.3 pascals