How macroscopic order emerges from microscopic chaos — and why time has a direction.
10 topics · 12 curated works
No prior grounding assumed.
Thermodynamics: Crash Course Physics #23
Shini Somara (CrashCourse) · 2016
Walks through the zeroth, first and second laws of thermodynamics and why they rule out perpetual motion, for a viewer who has never seen them before.
Assumes you know the vocabulary.
Reflections on the Motive Power of Fire
Sadi Carnot · 1824
Argues that the efficiency of any heat engine is capped by the temperature difference it operates across alone, independent of the working substance,…
+2 more at this level
Primary sources and full treatments.
The Mechanical Theory of Heat
Rudolf Clausius · 1867
States the first and second laws as 'the energy of the universe is constant; the entropy of the universe tends to a maximum,' giving entropy its name…
+7 more at this level
12 works
Shini Somara (CrashCourse)
Walks through the zeroth, first and second laws of thermodynamics and why they rule out perpetual motion, for a viewer who has never seen them before.
link checked 17 Sept 2026Sadi Carnot
Argues that the efficiency of any heat engine is capped by the temperature difference it operates across alone, independent of the working substance, founding what became the second law.
link checked 17 Sept 2026Arthur Eddington
Argues that the second law of thermodynamics, not any law of mechanics, is what gives time its direction, coining the phrase 'time's arrow'.
361 pageslink checked 17 Sept 2026PBS Space Time
Argues that entropy is a count of indistinguishable microstates rather than a measure of disorder, and that the popular framing is what makes the second law seem mysterious.
link checked 17 Sept 2026Rudolf Clausius
States the first and second laws as 'the energy of the universe is constant; the entropy of the universe tends to a maximum,' giving entropy its name and its physical meaning.
link checked 17 Sept 2026J. Willard Gibbs
Builds statistical mechanics around the ensemble — a probability distribution over possible microscopic states — rather than following any single system through time.
207 pageslink checked 17 Sept 2026James Jeans
Derives pressure, temperature and diffusion in a gas from the statistics of colliding molecules, turning thermodynamics into a consequence of mechanics.
442 pageslink checked 17 Sept 2026Lev Landau & Evgeny Lifshitz
Introduces the mean-field order-parameter theory of phase transitions and treats fluctuations and phase coexistence within one statistical framework.
544 pageslink failing as of 17 Sept 2026Lars Onsager
Sets out the reciprocal relations between coupled irreversible flows — a symmetry in the near-equilibrium response of a system that holds regardless of the microscopic mechanism involved.
link checked 17 Sept 2026Kenneth G. Wilson
Explains how the renormalization group solves critical phenomena by treating scale itself as the variable to integrate out, unifying phase transitions across otherwise unrelated physical systems.
link checked 17 Sept 2026Christopher Jarzynski
Shows that an equilibrium free-energy difference can be recovered exactly by averaging over many arbitrarily fast, far-from-equilibrium trials, not just slow reversible ones.
5 pageslink checked 17 Sept 2026Koji Maruyama, Franco Nori & Vlatko Vedral
Surveys a century of attempts to exorcise Maxwell's demon, and argues Landauer's link between erasing information and generating heat is what finally does it.
26 pageslink checked 17 Sept 2026