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 O b. 106.52 kPa O c.+ 106.52 kPa O d. +7.83 kPa

Answer 1

Title - Pressure Measurement

0 Given Pressure 800 mm Hg Vacuum Sg of mercury = 13.6 Sw of water = 9.78 kN/m² To find Pressure in kla We know I atmosphere = 760 mm of Hg I atmosphere nHg 101.325 kPa = 760 mm 1. 800 mm Hg 2 760 101-325 Х 800 X 101.325 760 x 106.52 kPa stated Vacuum, a As the Pressure negative sign is included Answer: b.-106.52 kPa

Summary - The vacuum pressure is the pressure below atmospheric pressure and thus negative sign is associated with this pressure value.