Question

If the pressure head in an experiment is measured as 800 mmHg vacuum, what is the corresponding pressure in kPa ? sg of mercury = 13.6 specific weight of water = 9.78 kN/m Select one: O a. +7.83 kPa Ob + 106.52 kPa O c.-106.52 kPa O d. - 7.83 kPa

Answer 1

Solution:

Principle Used: Pressure head in (mm of Hg) means the presure that would be exerted if we take a tube filled with Hg to the mm^th height and take measurements at the base of the tube.

Formula Used : Pressure = Density x Height x acc due to gravity =  

• 1 mm Hg to kPa = 0.13332 kPa
• This means 800 mm of Hg = 0.13332 x 800 = +106.56 kPa

Result: Option b

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