Which of the following is NOT a state variable of thermodynamics?
Correct answer: D. Density
- A. Entropy
- B. Internal energy
- C. Volume
- D. Density
Explanation
Density is not a state variable of thermodynamics because it depends on both the state variables of volume and mass. In thermodynamics, state variables are properties of a system that depend only on the current state and not on the path the system took to reach that state.
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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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