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If the system is isothermal, that means that the system and surroundings do not exchange matter or energy between each other. This is the case for a reversible expansion because the temperature must be constant in order for the volume to fluctuate so that the pressure is kept constant.
At the end of class today, Dr. Lavelle said that the system's temperature is constant despite work being done because heat from the surroundings is being added. I didn't understand how the system could be isothermal then if there is heat exchange between the system and its surroundings.
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