Another riddle: Three identical cylinders are filled with unknown quantities of ideal gases. The cylinders are closed with identical frictionless pistons of mass M. Cylinders A and B are in thermal equilibrium with the room at 20 oC, and cylinder C is kept at a temperature of 80 oC. Is the pressure of Nitrogen gas in cylinder A greater than, less than, or equal to the pressure of the Hydrogen gas in cylinder B? Is the pressure of Hydrogen gas in cylinder C greater than, less than, or equal to the pressure of Hydrogen gas in cylinder B? Why?