Question

what is Mercury barometer​

Answer 1

Answer:

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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.

Answer 2

Answer:

A mercury barometer is an instrument used to measure atmospheric pressure in a certain location and has a vertical glass tube closed at the top sitting in an open mercury-filled basin at the bottom.

OR

A mercury barometer is a device that is used to measure the atmospheric pressure at a given location.