Earth Sciences homework help. A certain amount of ideal gas is trapped in a container under a piston, subject to atmospheric pressure. Compare the amount of heat Q1 received by this gas in a process in which the piston is fixed with the amount of heat Q2 received by the gas in a process in which the piston can move freely, if the temperature of the gas increasesin both processes by the same amount. Give thorough explanations using the first law of thermodynamics.