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Question
The atmospheric pressure at a place is 650 mm of Hg. Calculate this pressure in Pascals (Pa).
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Solution
Height of mercury column = h = 650 mm
h = 65 cm = 0.65 m
Density of mercury = ρ= 13600 kg/m3
Acceleration due to gravity = g = 10 ms−2
Pressure (P) = 650 mm of Hg = hρg
= 0.65 × 13600 × 10
= 88400 Pa
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