1. The problem statement, all variables and given/known data Q.1)A gas cylinder is lifted from the ground floor to the first floor.What is the amount of work done on the gas?What is the amount of work done by the gas?Is the internal energy of the gas increased? Q.2)When we place a gas cylinder on a car and the car moves,does the kinetic energy of the molecules increase?Does the temperature increase.? 2. Relevant equations 3. The attempt at a solution Reasoning 1) The work done on the gas or by the gas is given by pΔv,which is zero in both the cases.The internal energy of the gas shouldn't change.But then the work done by the external agent changes the potential energy of the CM as the cylinder moves upwards.How do we see this in light of the work done by the external agent? Reasoning 2)Since neither the heat is supplied ,nor there is change in the volume of the cylinder,the internal energy of the gas should remain same.So,the kinetic energy of the molecules should also remain the same. Is my reasoning correct?