The pressure in an ideal gas is cut in half slowly, while being kept in a container with rigid walls. In the process, 465 kJ of heat left the gas.
- How much work was done during this process?
- What was the change in internal energy of the gas during this process?
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This is Giancoli Answers with Mr. Dychko. The work done by the gas is the force it applies to its container times the distance that it pushes the piston near the container bigger but the container doesn't change its volume at all. And we can think of this force as pressure times area and area times d is going to be the change in volume but since there's no change in volume there's no work done at all. The change in internal energy is the heat absorbed by the gas minus the work done by it and it absorbs a negative amount because it loses this 465 kilojoules. And so the change in internal energy is, is a negative 465 kilojoules because it's this heat that it gained negative 465 is minus zero. And so there we go negative 465 kilojoules is the change in internal energy.
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