A vacuum gauge indicates that the pressure of air in a closed chamber is 02 bar (vacuum) The pressure of the surrounding atmosphere is equivalent to 750 in of mercury The density of mercury is 13.95 g / cn and the acceleration of gravity is 9.8. / Determine the absolute pressure within the chamber in bar.

Question

Krystal

Engineering

7 November, 12:32

A vacuum gauge indicates that the pressure of air in a closed chamber is 02 bar (vacuum) The pressure of the surrounding atmosphere is equivalent to 750 in of mercury The density of mercury is 13.95 g / cn and the acceleration of gravity is 9.8. / Determine the absolute pressure within the chamber in bar.

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Kelton · Answer 1

Pvac = 0.2 bar

Patm = 750 mm Hg

P Hg = 13.59 g/cm^3 * (1kg/10^3g) (10^2cm/1m) ^3 = 13590 kg/m^3

g = 9.81 m/s^2

Patm = P Hg*g*L Hg

= 13590 kg/m^3 * (9.81 m/s^2) * (0.75 m)

= 100 * 10^3 * 1N/1kgms^-2 * 1 bar / 10^5 Nm^-2

= 1 bar

Pabs = Patm - Pvac = 1-0.2

= 0.8 bar