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Gas expansion

  1. Apr 22, 2014 #1
    When an ideal gas expands in a piston during an isothermal process, does it necessarily absorbs heat from the surroundings in order to maintain its temperature? (Piston is not insulated).

    IF yes,

    When the same procedure is carried out in a perfectly insulated piston, then temperature drops doesn't it?

    Thanks in advance
  2. jcsd
  3. Apr 22, 2014 #2
    If your system is just the piston and the environment, where else would the heat come from? Heat is just the exchange of energy due to temperature difference, right? And when the piston expands the temperature on the inside of the piston drops. To keep the process isothermal, yes, it will have to absorb energy from the surroundings.
  4. Apr 22, 2014 #3
    Yes and yes.

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