Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 15 - The Laws of Thermodynamics - Questions: 3



Work Step by Step

One example is a system that undergoes a change of state (melting/freezing, boiling/condensing) because heat is transferred but the temperature remains constant. Another example may be found from the first law of thermodynamics. $$\Delta U = Q-W$$ The change in internal energy can be zero, even though Q is nonzero, if Q=W. The amount of work done on or done by the system equals the heat expelled or added. An example is the isothermal expansion of an ideal gas.
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