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Can someone please explain the diagram from Wednesday's lecture? It consisted of a vacuum, work being done, external pressure, and heat. Is this a container with a gas? I'm mostly confused as to what's happening and in what system. Thanks!
The diagram is of a heat reservoir, meaning that it is always at the same temperature. The ideal gas expands into the vacuum and does work, but to remain at the same temperature, heat is added. When it expands, it pulls up the mass. Delta U is still 0 because q + w = 0, where heat added is equal to work performed. The gas still expands because of an entropy increase, not because of "energetic reasons."
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