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Douglas Harper's Etymology Dictionary

unit of pressure, 1949, named for Italian physicist Evangelista Torricelli (1608-1647), inventor of the barometer.


n. A unit of pressure that is equal to approximately 1.316·10-3 atmosphere or 133.3 pascals.


n. a unit of pressure equal to 0.001316 atmosphere; named after Torricelli [syn: millimeter of mercury, mm Hg]


The torr (symbol: Torr) is a unit of pressure based on an absolute scale, now defined as exactly of a standard atmosphere. Thus one torr is exactly (~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 ). 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.

Torr (surname)

Torr is an English surname. Notable people named Torr include

  • A. C. Torr, punning pseudonym of actor Frederick Hobson Leslie (1866–1892)
  • Michèle Torr (born Michelle Cléberte Tort in 1947), French singer and author
  • William George Torr (1853–1939), teacher and religious educator in South Australia
Torr (disambiguation)

Torr may refer to:

  • Torr, a unit of pressure
  • Torr (surname), an English surname (including a list of persons with the name)
  • Torr Works, a limestone quarry in Somerset, England
  • Torr., the standard botanical author abbreviation for John Torrey

Usage examples of "torr".

Torr at his side he walked through the fringes of the forest, studying sterculias and palms.

If some modern-day freelance Danite was behind all this, Robin Torr wanted nothing to do with it.

Torr at his side he walked through the fringes of the forest, studying sterculias and palms.

In quasi tutte le coste del Mediterraneo vi sono torri di guardia, che servivano al tempo dei pirati barbareschi per dar avviso delle loro apparizioni.

Intanto non era un'unica massa di terra, ma era costituita da cento corpi diversi uniti fra loro da archi di roccia, un vasto arcipelago che somigliava a una grande cattedrale galleggiante, con ponti a fare da contrafforti, torri sempre più alte via via che si avvicinavano al centro dell'isola dalla quale si alzavano a incontrare il cielo dense colonne di fumo.

In confronto a quel luogo, le distese inquinate di Los Angeles mi sembravano ripugnanti, e Dallas, con le sue torri e autostrade, fredda e dura.

The message ended with two signoffs: "Best of luck, Dopples," and "Love, Torra.