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An italic capital S, a measure of how many ways a state can be arranged.
Also known as: Entropy, Thermodynamic entropy, Boltzmann entropy
Entropy counts the microscopic arrangements consistent with what you can measure, and the second law says it never decreases in an isolated system. Boltzmann's formula linking it to a logarithm of that count is carved on his gravestone.
Denotes entropy, a state function measured in joules per kelvin.
Contexts: Laboratory
Equals the Boltzmann constant times the logarithm of the number of accessible microstates, which is Boltzmann's statistical definition.
Contexts: Laboratory
Collides with action, the Poynting vector and the total spin quantum number, all written with a capital S.
Contexts: Laboratory
An italic capital letter S, a double curve reversing at the middle.