Why is barometric pressure at a place is expressed in centimeters of mercury rather than in Pascal?
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Because the scale of the barometer is in centimetres
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The barometric pressure at a place is centimetres of mercury rather than in pascal, because -
• First of all,the barometer indicates atmospheric pressure by the height of the mercury level inside the column of the barometer.
• So,the length will be the primary physical quantity for measuring the height of the mercury column which indirectly indicates the atmospheric pressure amount. And,we don't have to do unit conversion.
• And, 1 cm mercury height is equal to 1333.2239 pascal and the normal atmospheric pressure is approximately equal to the 76.5 cm mercury height. So,if we convert mercury column height into pascal ,the numerical value will be huge and dealing with such numerical values in measurement is not convenient at all.
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