"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."Is the definition according to google:)
Explanation:
In barometer In the mercury barometer, atmospheric pressure balances a column of mercury, the height of which can be precisely measured.I HOPE IT HELPS:)in general it weighs atmospheric pressure and is a barometer:)
