A cylinder of gas with a movable piston contains 1.0 x 10^-3 m^3 of helium at -100.0 degrees C. The piston area is 4.8 cm^2 and it has a 5.0-kg mass. the entire assembly is in a vacuum chamber. What is the pressure of the helium? The gas is slowly heated to a temperature of 0 degrees C. How much heat transfer occurs?