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Which of the following statements are true with respect to heat and work? (i) They are boundary phenomena (ii) They are exact differentials (iii) They are path functions

1. both (i) and (ii)
2. both (i) and (iii)
3. both (ii) and (iii)
4. only (iii)

Correct answer: both (i) and (iii)

Solution

Heat and work are energy interactions that occur at the boundary of a system, so they are boundary phenomena. They depend on the path followed during the process and are therefore path functions, not exact differentials.

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