Mercury is used in a barometer because it has the ____________ density for a liquid.

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Solution

mercury is used in the barometer because it is a high-density fluid which gives less height of column for high pressures.
For instance if we use water in a barometer then the height of the barometer required would be 13.6 times taller than the mercury barometer to obtain the same pressure difference.
It is because the density of mercury is 13.6 times that of water.
Thus, mercury is used in a barometer because it has the highest density for a liquid.

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