liquid-column barometer

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• Barometer — Schematic drawing of a simple mercury barometer with vertical mercury column and reservoir at base …   Wikipedia

• fluid mechanics — an applied science dealing with the basic principles of gaseous and liquid matter. Cf. fluid dynamics. [1940 45] * * * Study of the effects of forces and energy on liquids and gases. One branch of the field, hydrostatics, deals with fluids at… …   Universalium

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• Pressure measurement — The construction of a bourdon tube gauge, construction elements are made of brass Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure pressure are called pressure gauges or vacuum gauges. A… …   Wikipedia

• Torr — For the standard botanical author abbreviation Torr., see John Torrey. The torr (symbol: Torr) is a non SI unit of pressure with the ratio of 1 to 760 standard atmosphere, chosen to be roughly equal to the fluid pressure exerted by a millimetre… …   Wikipedia

• Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry       The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …   Universalium

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• Vacuum pump — A vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum. The vacuum pump was invented in 1650 by Otto von Guericke. Types Pumps can be broadly categorized according to three… …   Wikipedia

• Surface tension — For the work of fiction, see Surface Tension (short story). Surface tension is a property of the surface of a liquid that causes it to behave as an elastic sheet. It allows insects, such as the water strider (pond skater, UK), to walk on water.… …   Wikipedia

• Evangelista Torricelli —     Evangelista Torricelli     † Catholic Encyclopedia ► Evangelista Torricelli     Italian mathematician and physicist, born at Faenza, 15 October, 1608; died at Florence, 25 October, 1647. Modigliana, in Tuscan Romagna, and Piancaldoli, in the… …   Catholic encyclopedia

• Atmospheric pressure — Air pressure redirects here. For the pressure of air in other systems, see pressure. Atmospheric pressure is the force per unit area exerted against a surface by the weight of air above that surface in the Earth s atmosphere. In most… …   Wikipedia