Practice question · Select all that apply
Which processes do zero work on or by a gas?
Hints
- Work needs both a volume change and something to push against.
- The isothermal expansion has both, so it does work.
Show the answer
- A. A rigid sealed container being warmed
- B. A constant-volume heating
- C. Expansion into an evacuated chamber
Why
Free expansion has no opposing pressure and constant-volume processes have no , so all three give zero. An isothermal expansion against a piston has both ingredients and does .
Practise Work and the Joule Experiment
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