#SPACEPLAN FREE TORR DOWNLOAD#
The torr is used in high-vacuum physics and engineering.SPACEPLAN Deluxe download lite. For example, the bar is used in meteorology to report atmospheric pressures. These four pressure units are used in different settings.
The torr (symbol: Torr), defined as 1 / 760 atm exactly. The atmosphere (symbol: atm), defined as 101.325 kPa exactly. The bar (symbol: bar), defined as 100 kPa exactly. This small difference is negligible for most applications outside metrology. The difference between one millimeter of mercury and one torr, as well as between one atmosphere (101.325 kPa) and 760 mmHg ( 101.3 kPa), is less than one part in seven million (or less than 0.000 015%). The relationship between the torr and the millimeter of mercury is: The decimal form of this fraction ( 133.322 368 421 052 631 578 947) is an infinitely long, periodically repeating decimal ( repetend length: 18). Therefore, 1 Torr is equal to 101 325 / 760 Pa. The torr is defined as 1 / 760 of one standard atmosphere, while the atmosphere is defined as 101 325 pascals. The millimeter of mercury by definition is 133.322 387 415 Pa ( 13.5951 g/cm 3 × 9.806 65 m/s 2 × 1 mm), which is approximated with known accuracies of density of mercury and standard gravity. Nevertheless, manometric units are routinely used in medicine and physiology, and they continue to be used in areas as diverse as weather reporting and scuba diving. Manometric units are units such as millimeters of mercury or centimeters of water that depend on an assumed density of a fluid and an assumed acceleration due to gravity. See also: Pressure measurement § Liquid column This yields a precise definition that is unambiguous and independent of measurements of the density of mercury or the acceleration due to gravity on Earth. The torr was then redefined as 1 / 760 of one atmosphere. In 1954, the definition of the atmosphere was revised by the 10 e Conférence Générale des Poids et Mesures (10th CGPM) to the currently accepted definition: one atmosphere is equal to 101 325 pascals. However, since the acceleration due to gravity – and thus the weight of a column of mercury – is a function of elevation and latitude (due to the rotation and non- sphericity of the Earth), this definition is imprecise and varies by location. In honour of Torricelli, the torr was defined as a unit of pressure equal to one millimeter of mercury at 0 ☌. Over time, 760 millimeters of mercury at 0 ☌ came to be regarded as the standard atmospheric pressure. When these fluctuations were explained as a manifestation of changes in atmospheric pressure, the science of meteorology was born. Scientists at the time were familiar with small fluctuations in height that occurred in barometers. He is credited with giving the first modern explanation of atmospheric pressure. Torricelli attracted considerable attention when he demonstrated the first mercury barometer to the general public. Although frequently encountered, the alternative spelling "Tor" is incorrect. The torr is sometimes incorrectly denoted by the symbol "T", which is the SI symbol for the tesla, the unit measuring the strength of a magnetic field. The symbol (uppercase) should be used with prefix symbols (thus, mTorr and millitorr are correct, but mtorr and milliTorr are not). The unit name torr is written in lower case, while its symbol ("Torr") is always written with upper-case initial including in combinations with prefixes and other unit symbols, as in "mTorr" (millitorr) or "Torr⋅L/s" (torr-litres per second).
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