Question

A cylinder containing an ideal gas is vertical position and has a piston of mass M that is able to move up or down without friction. If the temperature is increased.

• A. Both P and V of the gas will change
• B. Only P will increase according to Charle’s law
• C. V will change but not P
• D. P will change but not V

Answer 1

Answer: (C)

V will change but not P

Answer 2

Pressure = force/are = Mg / area of the piston = constant.If the temperature is increased , only the volume increases as the piston moves up without frictions. Recall $V \propto T$at constant pressure.