A gas is contained in a cylinder with a movable piston. Initially, the gas has a pressure of 2 atm and a volume of 4 L. If the pressure changes to 4 atm while the temperature remains constant, what is the new volume of the gas?

• A. 8 L
• B. 4 L
• C. 2 L
• D. 1 L

Answer: (C)