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2014-11-07T17:42:43+05:30

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1 pascal is not equal to 760 mm of Hg.
 
1 pascal = 1 N/m²
density of mercury = 13594 kg/m³
let mercury is present in a tube with base area = 1m²
then we need to find the height for which the pressure is 1 Pascal.
let the height is = h
weight = ρVg = 13594×(h×1)×9.81 = 133357.14h N

pressure = weight/area = 133357.14h N / 1m²
              = 133357.14 N/m² = 1 N/m²
⇒ 1 = 133357.14h
⇒ h = 1/133357.14 m
⇒ h = 7.4986×10^-6 m
⇒ h = 7.4986×10^-3 mm
⇒ h = 0.0074986 mm of Hg

So 1 Pascal = 0.0074986 mm of Hg

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