Standard atmospheric pressure - (in mm of mercury In an...

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Standard atmospheric pressure Corresponds to typical atmospheric pressure at sea level The pressure needed to support a column of mercury 760 mm in height Equals 1.01325 x 10 5 Pa Relationship to other common units of pressure: (Note that 1 torr = 1 mm Hg) Pressures of Enclosed Gases and Manometers A manometer is used to measure the pressure of an enclosed gas. Their operation is similar to the barometer, and they usually contain mercury A closed tube manometer is used to measure pressures below atmospheric An open tube manometer is used to measure pressures slightly above or below atmospheric In a closed tube manometer the pressure is just the difference between the two levels
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Unformatted text preview: (in mm of mercury) In an open tube manometer the difference in mercury levels indicates the pressure difference in reference to atmospheric pressure Other liquids can be employed in a manometer besides mercury. • The difference in height of the liquid levels is inversely proportional to the density of the liquid • i.e. the greater the density of the liquid, the smaller the difference in height of the liquid • The high density of mercury (13.6 g/ml) allows relatively small manometers to be built...
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