Which one of the following is a state function ________________?
Correct answer: D. all of the above
- A. pressure
- B. temperature
- C. enthalpy
- D. all of the above
Explanation
Pressure, temperature and enthalpy are all state functions because their values depend only on the present state of the system, not on how that state was reached. Students may choose only enthalpy because it is the most familiar thermodynamic quantity, overlooking that pressure and temperature also have state-defined values.
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About System, Surroundings and State Functions
A system is the part of the universe under study, while everything outside it is the surroundings; the boundary separates them. State functions such as pressure, temperature, volume, internal energy and enthalpy depend only on the state, unlike heat and work, which depend on the path taken.
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