Entropy as a Microstate-Counted State Function
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State
Entropy is a state function, per Chem 0675, and counts the microstates consistent with a system's current condition, rising whenever that count rises.
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A gas expanding into a larger volume gains far more particle positions, so its entropy rises.
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Entropy is not energy despite its joule units, and no single particle "has" entropy.
Builds on
Unlocks
- 2071 Twin: Entropy Is Not Disorder
- 2074 Entropy Rises with Accessible Microstates
- 2077 Entropy Trend Across Phases
- 2080 Entropy Rises with Temperature
- 2083 Entropy Rises with Molecular Complexity
- 2084 Entropy Rises with Mixing
- 2090 The Second Law of Thermodynamics
- 2093 The Third Law of Thermodynamics
- 2103 Gibbs Free Energy Defined
- 2124 ΔG as a Path-Independent State Function