Question

What are the advantages of using barometric liquid

Answer 1

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Mercury is relatively denser than water, consequently the length of the column of water would have to be about 34 feet high to exert pressure equal to that of the atmosphere while the column of mercury need to be  only 30 inches to exert pressure equal to that of the atmosphere.
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Answer 2

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• 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.

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