Entropy
The entropy of a macrostate is related to the multiplicity of the macrostate. And entropy has the advantage of being an extensive property, so it is usually more convenient to work with than the (non-extensive) multiplicity.

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Probabilistic Definition of Entropy

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Extensive and Intensive Properties

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Entropy, Microstates, and the Sign of ΔS | 18.2 General Chemistry

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The Most Misunderstood Concept in Physics

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What is Chemical Potential?

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The Man Who Understood Entropy.

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Trump Faces GOP Fury Over Iran Deal; Fox News Blames JD Vance; Iran Gets $300 Billion: A Closer Look

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Boltzmann's Entropy Equation: A History from Clausius to Planck

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We're 99.9% sure this pattern is true, but no one can prove it

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The Principle of Maximum Entropy

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What is the Ultraviolet Catastrophe?

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Helmholtz and Gibbs Free Energy | Physical Chemistry I | 046

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A Short Introduction to Entropy, Cross-Entropy and KL-Divergence

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Entropy, Macrostates & Microstates | Thermodynamics

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Introduction Gibbs Free Energy = Entropy of the Universe and the 2nd Law of Thermodynamics Chemistry

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Statistical Definition of Entropy | Physical Chemistry I 040

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Relationship Between Entropy and Internal Energy

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2.6 Entropy (Thermal Physics) (Schroeder)

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Watch this if everything feels too much (gentle comfort for tired women)

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