Torr

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Torr

Organisation

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(For other uses, see Torr (disambiguation).) The torr (symbol: Torr) is a unit of pressure based on an absolute scale, now defined as exactly 1/760 of a standard atmosphere. Thus one torr is exactly 101325/760 pascals (~133.3 Pa). Historically, one torr was intended to be the same as one "millimetre of mercury". However, subsequent redefinitions of the two units made them slightly different (by less than 0.000015%). The torr is not part of the International System of Units (SI), but it is often combined with the metric prefix milli to name one millitorr (mTorr) or 0.001 Torr. The unit was named after Evangelista Torricelli, an Italian physicist and mathematician who discovered the principle of the barometer in 1644.

English Wikipedia http://en.wikipedia.org/wiki/Torr

Spanish wikipedia http://es.wikipedia.org/wiki/Torr

Wiki page external link http://www.npl.co.uk/pressure/punits.html