H-theorem

E57430

The H-theorem is Boltzmann’s foundational result in statistical mechanics that explains the irreversible increase of entropy in a gas from time-reversible microscopic dynamics, providing a key link between mechanics and the second law of thermodynamics.

AI illustration

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AI-generated illustration of H-theorem

This AI-generated illustration was produced by black-forest-labs/FLUX.2-dev (1024x1024) from a prompt written by openai/gpt-oss-120b from the entity's label + description.

Prompt

Generate an image of the H-theorem (The H-theorem is Boltzmann’s foundational result in statistical mechanics that explains the irreversible increase of entropy in a gas from time-reversible microscopic dynamics, providing a key link between mechanics and the second law of thermodynamics.)

All labels observed (4)

Label Occurrences
H-theorem canonical 5
Boltzmann H-theorem 2
Boltzmann’s H-theorem 2

How this entity was disambiguated

Statements (48)

Predicate Object
instanceOf concept in thermodynamics ⓘ
result in kinetic theory ⓘ
theorem in statistical mechanics ⓘ
aimsToExplain why macroscopic processes are time-asymmetric ⓘ
appliesTo dilute classical gas ⓘ
non-equilibrium states near equilibrium ⓘ
associatedWith Boltzmann equation for one-particle distribution function ⓘ
author Ludwig Boltzmann ⓘ
basedOn classical mechanics ⓘ
time-reversible microscopic dynamics ⓘ
connects microscopic dynamics and macroscopic thermodynamic behavior ⓘ
describes approach to equilibrium in a dilute gas ⓘ
explains entropy production in a dilute gas ⓘ
macroscopic irreversibility from microscopic dynamics ⓘ
field kinetic theory of gases ⓘ
statistical mechanics ⓘ
thermodynamics ⓘ
hasConsequence equilibrium Maxwell–Boltzmann distribution ⓘ
implies monotonic decrease of H-function over time ⓘ
monotonic increase of entropy-like quantity ⓘ
influenced modern non-equilibrium statistical mechanics ⓘ
philosophy of time’s arrow ⓘ
interpretation entropy increase is overwhelmingly probable, not strictly necessary ⓘ
introducedIn 1870s ⓘ
involves coarse-graining of microstates ⓘ
collision term in Boltzmann equation ⓘ
one-particle distribution function ⓘ
relatedConcept Boltzmann’s entropy formula S = k log W ⓘ
Gibbs entropy ⓘ
Poincaré recurrence theorem ⓘ
coarse-grained entropy ⓘ
ergodic hypothesis ⓘ
relatesTo Boltzmann entropy ⓘ
Boltzmann equation ⓘ
H-function ⓘ
entropy increase ⓘ
irreversibility ⓘ
second law of thermodynamics ⓘ
time-reversal invariance ⓘ
shows H-function is stationary at equilibrium ⓘ
irreversible behavior emerges from probabilistic assumptions ⓘ
status approximate result dependent on molecular chaos assumption ⓘ
subjectOf Loschmidt paradox ⓘ
linked to: H-theorem

Zermelo recurrence objection ⓘ
debates on foundations of statistical mechanics ⓘ
supports statistical interpretation of the second law ⓘ
usesConcept Stosszahlansatz ⓘ
linked to: Boltzmann equation

molecular chaos assumption ⓘ

How these facts were elicited

Referenced by (11)

Full triples — surface form annotated when it differs from this entity's canonical label.

Ludwig Boltzmann → notableIdea → H-theorem ⓘ
Boltzmann–Gibbs entropy → relatedTo → H-theorem ⓘ
Boltzmann equation → implies → Boltzmann H-theorem ⓘ
linked to: H-theorem
Boltzmann equation → relatedTo → H-theorem ⓘ
H-theorem → subjectOf → Loschmidt paradox ⓘ
linked to: H-theorem
Kac ring model → relatedTo → H-theorem ⓘ
Kac ring model → relatedTo → Loschmidt paradox ⓘ
linked to: H-theorem
Boltzmann collision operator → relatedTo → Boltzmann H-theorem ⓘ
linked to: H-theorem
Zermelo recurrence objection → critiques → Boltzmann’s H-theorem ⓘ
linked to: H-theorem
Ehrenfest model → illustratesConcept → Boltzmann’s H-theorem ⓘ
linked to: H-theorem