Why is a water barometer taller than the mercury barometer??
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Mercury is commonly used in barometers because its high density means the height of the column can be in a reasonable size for measuring atmospheric pressure. Mercury is relatively denser than water. A water barometer would need to be 13.6 times taller than the mercury barometer to obtain the same pressure difference.
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Firstly the water have a more amount of relative density when compared to that of the mercury. This only reason is the one of the biggest propose for not using water in the barometer and so the mercury is used in the barometer.
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