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Question
Convert 1 mm of Hg into pascal. Take density of Hg = 13.6 x 103 kg m-3 and g = 9.8 m s-2 .
Solution
Density of Hg = `13.6 xx 10^3` kgm-3
Acceleration due to gravity , g = 9.8 ms-2
Height of mercury column = 1mm = 0.001 m
∴ Pressure , P = hρg
or , P = `(0.001)(13.6 × 10^3)(9.8)` pascal
or , P = 133.28 Pa
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