Calculation of height of water column in barometer

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A standard mercury barometer to measure atmospheric pressure is a tube with one end sealed. The sealed end is close to zero pressure, while the other end is open to the atmosphere. The pressure difference between the two ends of the tube can maintain a column of fluid in the tube, with the height of the column being proportional to the pressure difference. If the closed end has negligible pressure, the height of the column is proportional to atmospheric pressure being measured.

Mercury is commonly used in barometers because its high density means the height of the column can be a reasonable size to measure atmospheric pressure. A barometer using water, for instance, would need to be 13.6 times taller than a mercury barometer to obtain the same pressure difference. This is because mercury is 13.6 times more dense than water.

[srisahasrabhatt]

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[sahajanaikvihasnaik]

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[itsmeshivajyothi]

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[sainimeka]

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[satyanarayanapuli]

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[sirajuddinmd]

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[whitestar]

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