what is mercury barometer
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a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure...
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The mercury barometer is the instrument used to measure pressure. It is made by filling the long last you with Mercury and then turning it upside down in the bowl of Mercury. The column of mercury is held up by the air pressure. As the air pressure varies from day to day depending on the weather conditions the height of mercury in the tube also varies. The height is measured to find the pressure.
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