Why mercury is used in a barometer?
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Mercury has negligible vapour pressure and high density. Hence, it is used in barometer
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Mercury is commonly used inbarometers because its high density means the height of the column can be a reasonable size to measure atmospheric pressure. A barometerusing water, for instance, would need to be 13.6 times taller than a mercury barometer to obtain the same pressure difference.
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Mercury is commonly used inbarometers because its high density means the height of the column can be a reasonable size to measure atmospheric pressure. A barometerusing water, for instance, would need to be 13.6 times taller than a mercury barometer to obtain the same pressure difference.
_________________________________
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