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sgstudent
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Homework Statement
A fixed mass of gas is trapped in a metal cylinder by a movable piston. The piston is moved outwards slowly. The volume of gas increases but the internal energy is unchanged. What happens to the pressure and to the temperature of the gas?
Homework Equations
none
The Attempt at a Solution
I think the pressure and temperature will decrease because when I move the piston back, the distance apart each gas particle increases so the potential energy will increase (similar to boiling or melting when particle distance increases). So for internal energy to remain unchanged, the kinetic energy have to decrease explaining the decrease in temperature. So with the greater volume and lower temperature pressure has to be decreased.
Is this correct? This was an O level MCQ question to give everyone a better understanding of the level I am in.
Thanks for the help