Homework Help: physics

Posted by HELP, need ASAP on Monday, December 5, 2011 at 11:09am.

Container with movable piston at top and valve near bottom is filled an ideal gas. Valve is opened and some gas slowly escapes. Valve is then closed and the piston appears to be at a lower position. System is in thermal equilibrium. Is final pressure of container, greater, less or equal?

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