Question

Why mercury is used in a barometre?

Answer 1

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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Answer 2

It is used in barometer because of its high density, its a heavy liquid that helps. one can use water in barometer but would end up refilling the water barometer constantly.

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