Suppose the pressure at the surface of mercury in a barometer tube is P1 and the pressure at the surface of mercury in the cup is P2.
Suppose the pressure at the surface of mercury in a barometer tube is P1 and the pressure at the surface of mercury in the cup is P2.
(a) P1 = 0, P2 = atmospheric pressure
(b) P1 = atmospheric pressure, P2 = 0
(c) P1 = P2 - atmospheric pressure
(d) P1 = P2 = 0.
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(a) P1= 0, P2 = atmospheric pressure
EXPLANATION:
Since there is nothing above the surface of the mercury in the tube the density above this surface =0, hence the pressure P₁ =0, and the pressure at the surface of the mercury in the cup is P₂ = atmospheric pressure.
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