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torr |
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torr
[tôr] Etymology: Evangelista Torricelli, Italian physicist, 1608-1647 a unit of pressure equal to 1333.22 dynes/cm2, or 1.33322 millibars. One torr is the pressure required to support a column of mercury 1 mm high when the mercury is of standard density and subjected to standard acceleration. These standard conditions are 0° C and 45° latitude, where the acceleration of gravity is 980.6 cm/sec2. In reading a mercury barometer at other temperatures and latitudes, corrections commonly exceeding 2 torr may be required to compensate for the thermal expansion of the measuring scale used. torr [tor] torr (tōr), n a unit of pressure equivalent to 0.001316 atmosphere; named after the physicist Torricelli. Also called mm Hg. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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