Gas is contained in a piston-cylinder assembly and undergoes three processes. Fi

Question

Gas is contained in a piston-cylinder assembly and undergoes three processes. First the gas is compressed at a constant pressure of 100 [kPa] from initial volume of 1.0 [m3] to a volume of 0.5 [m3]. Second, the gas pressure is increased at constant volume up to 200 [kPa]. Third, the gas is returned to its initial pressure and volume by a process for which P Forall = constant. All pressures given are absolute. For the gas as a system, is the system best considered open or closed? Why? System is open: gas volume varies System is closed: volume varies System is open: no mass enters/exits the piston-cylinder assembly System is closed, no mass enters/exits the piston-cylinder assembly

Explanation / Answer

Closed system means there is no exchange of matter with the surroundings.

And in a piston-cylinder assembly, no gas molecule escapes/enters the system.

So, B IS CORRECT as volume is changing.

In D, closed system itself means, no exchange of matter/mass!!!

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