Barometer
It is a device used to measure atmospheric pressure. In principle, any liquid can be used to fill the barometer, but mercury is the liquid generally filled because its great density makes possible any instrument of reasonable size.
P1
= P2
P2 = atmospheric pressure (P0)
P1 = 0 + ρgh { ρ= density of mercury}
P0 = ρgh
Thus mercury barometer reads the atmospheric pressure (P0) directly from the height of the mercury column.
For example, if the height of mercury in the barometer is 760 mm, then the atmospheric pressure will be ----
As, P0 = ρgh
P0
= (13.6 x 103)(9.8)(0.760)
P0 = 1.013 x 105
N/m2
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