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Q.

A barometer is used to measure atmospheric pressure in terms of the height of the mercury column. Here in terms of a vertical column of mercury, the atmospheric pressure at sea level is ____ cm.


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Detailed Solution

A barometer is used to measure the atmospheric pressure in terms of the height of the mercury column. Here in terms of a vertical column of mercury, the atmospheric pressure at sea level is 76 cm.
A barometer is used to measure the atmospheric pressure in terms of the height of the mercury column. Because of its high density, mercury is commonly used in barometers. Under normal atmospheric pressure, the mercury column takes a height of 76 cm. 76 cm vertical height of mercury exerts as much pressure as is exerted by the atmosphere. Therefore, the pressure exerted by 76 cm high mercury column is measured as 1 atmospheric pressure.
 
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