+1 vote
in Fluid Mechanics by (118k points)
Calculate the pressure exerted by 9 kg of air at a temperature of 20℃ if the volume is 0.8m3. Assuming ideal gas laws are applicable.

(a) 946 kN/m^2

(b) 1892 kN/m^2

(c) 1419 kN/m^2

(d) None of the mentioned

I got this question during an internship interview.

This interesting question is from Thermodynamic Properties & Compressibility topic in portion Properties of Fluids of Fluid Mechanics

1 Answer

+2 votes
by (362k points)
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Best answer
The correct option is (a) 946 kN/m^2

To elaborate: Ideal gas Law: PV=nRT

                     n=M/m

                     P=(9*8314*293)/28.97=946 kN/m^2.

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