Timeline of thermodynamics statistical mechanics and random processes

A timeline of events related to thermodynamics, statistical mechanics, and random processes.

Ancient times

• 5th century BC - the classical elements are used to support various theories of combustion; Empedocles writes about his four-element theory of earth, water, air, and fire
• 5th century BC - Leucippus and Democritus formulate the first philosophy of atomism
• 1st century BC - Lucretius writes his epic atomistic poem De Rerum Natura

Before 1800

• 1620 - Francis Bacon reviews a wide range of observations about heat and related phenomena, and suggests that heat is related to motion (Novum Organum, Book II, XI)
• 1669 - J.J. Becher puts forward a theory of combustion involving combustible earth (Latin terra pinguis).
• 1676-1689 - Gottfried Leibniz develops the concept of vis viva, a limited version of the conservation of energy
• 1694-1734 - Georg Ernst Stahl names Becher's combustible earth as phlogiston and develops the theory
• 1738 - Daniel Bernoulli publishes Hydrodynamics, initiating the kinetic theory
• 1761 - Joseph Black discovers that ice absorbs heat without changing its temperature when melting
• 1702 - Guillaume Amontons introduces the concept of absolute zero, based on observations of gases
• 1772 - Black's student Daniel Rutherford discovers nitrogen, which he calls phlogisticated air, and together they explain the results in terms of the phlogiston theory
• 1776 - John Smeaton publishes a paper on experiments related to power, work, momentum, and kinetic energy, supporting the conservation of energy
• 1777 - Carl Wilhelm Scheele distinguishes heat transfer by thermal radiation from that by convection and conduction
• 1783 - Antoine Lavoisier discovers oxygen and develops an explanation for combustion; in his book Reflexions sur le phlogistique, he deprecates the phlogiston theory and proposes a caloric theory
• 1791 - Pierre Prévost shows that all bodies radiate heat, no matter how hot or cold they are
• 1798 - Count Rumford (Benjamin Thompson) performs measurements of the frictional heat generated in boring cannons and develops the idea that heat is a form of kinetic energy; his measurements refute caloric theory, but are imprecise enough to leave room for doubt

1800-1847

• 1804 - Sir John Leslie observes that a matte black surface radiates heat more effectively than a polished surface, suggesting the importance of black body radiation
• 1805 - William Hyde Wollaston defends the conservation of energy in On the Force of Percussion
• 1808 - John Dalton defends caloric theory in A New System of Chemistry and describes how it combines with matter, especially gases; he proposes that the heat capacity of gases varies inversely with atomic weight
• 1810 - Sir John Leslie freezes water to ice artificially
• 1813 - Peter Ewart supports the idea of the conservation of energy in his paper On the measure of moving force; the paper strongly influences Dalton and his pupil, James Joule
• 1819 - Pierre Louis Dulong and Alexis Thérèse Petit give the Dulong-Petit law for the specific heat capacity of a crystal
• 1820 - John Herapath develops some ideas in the kinetic theory of gases but mistakenly associates temperature with molecular momentum rather than kinetic energy; his work receives little attention other than from Joule
• 1822 - Joseph Fourier formally introduces the use of dimensions for physical quantities in his Theorie Analytique de la Chaleur
• 1822 - Marc Séguin writes to John Herschel supporting the conservation of energy and kinetic theory
• 1824 - Sadi Carnot analyzes the efficiency of steam engines using caloric theory; he develops the notion of a reversible process and, in postulating that no such thing exists in nature, lays the foundation for the second law of thermodynamics
• 1827 - Robert Brown discovers the Brownian motion of pollen and dye particles in water
• 1831 - Macedonio Melloni demonstrates that black body radiation can be reflected, refracted, and polarised in the same way as light
• 1834 - Émile Clapeyron popularises Carnot's work through a graphical and analytic formulation
• 1841 - Julius Robert von Mayer, an amateur scientist, writes a paper on the conservation of energy, but his lack of academic training leads to its rejection
• 1842 - Mayer makes a connection between work, heat, and the human metabolism based on his obervations of blood made while a ship's surgeon; he calculates the mechanical equivalent of heat
• 1843 - John James Waterston fully expounds the kinetic theory of gases, but is ridiculed and ignored
• 1843 - James Joule experimentally finds the mechanical equivalent of heat
• 1847 - Hermann von Helmholtz publishes a definitive statement of the conservation of energy, the first law of thermodynamics

1848-1899

• 1848 - William Thomson extends the concept of absolute zero from gases to all substances
• 1849 - William John Macquorn Rankine calculates the correct relationship between saturated vapour pressure and temperature using his hypothesis of molecular vortices
• 1850 - Rankine uses his vortex theory to establish accurate relationships between the temperature, pressure, and density of gases, and expressions for the latent heat of evaporation of a liquid; he accurately predicts the surprising fact that the apparent specific heat of saturated steam will be negative.
• 1850 - Rudolf Clausius clarifies Carnot's statement of the Second Law; and establishes the importance of dQ/T, but does not yet name the quantity.
• 1852 - Joule and Thomson demonstrate that a rapidly expanding gas cools, later named the Joule-Thomson effect
• 1854 - Helmholtz puts forward the idea of the heat death of the universe
• 1854 - Rankine introduces his thermodynamic function, later identified as entropy
• 1856 - August Krönig publishes an account of the kinetic theory of gases, probably after reading Waterston's work
• 1857 - Clausius gives a modern and compelling account of the kinetic theory of gases in his On the nature of motion called heat
• 1859 - James Clerk Maxwell discovers the distribution law of molecular velocities
• 1859 - Gustav Kirchoff shows that energy emission from a black body is a function of only temperature and frequency
• 1865 - Clausius introduces the modern macroscopic concept of entropy
• 1867 - Maxwell asks whether Maxwell's demon could reverse irreversible processes
• 1870 - Clausius proves the scalar virial theorem
• 1872 - Ludwig Boltzmann states the Boltzmann equation for the temporal development of distribution functions in phase space, and publishes his H-theorem
• 1874 - Thomson formally states the second law of thermodynamics.
• 1876 - Josiah Willard Gibbs publishes the first of two papers (the second appears in 1878) which discuss phase equilibria, statistical ensembles, the free energy as the driving force behind chemical reactions, and chemical thermodynamics in general.
• 1876 - Johann Loschmidt criticises Boltzmann's H theorem as being incompatible with microscopic reversibility (Loschmidt's paradox).
• 1877 - Boltzmann states the relationship between entropy and probability.
• 1879 - Jožef Stefan observes that the total radiant flux from a blackbody is proportional to the fourth power of its temperature and states the Stefan-Boltzmann law.
• 1884 - Boltzmann derives the Stefan-Boltzmann blackbody radiant flux law from thermodynamic considerations.
• 1888 - Henri-Louis Le Chatelier states that the response of a chemical system perturbed from equilbrium will be to counteract the perturbation.
• 1893 - Wilhelm Wien discovers the displacement law for a blackbody's maximum specific intensity.

1900-1944

• 1900 - Max Planck suggests that light may be emitted in discrete frequencies, giving his law of black-body radiation
• 1905 - Albert Einstein argues that the reality of quanta would explain the photoelectric effect
• 1905 - Albert Einstein mathematically analyzes Brownian motion.
• 1906 - Walther Nernst presents a formulation of the third law of thermodynamics.
• 1907 - Albert Einstein uses quantum theory to estimate the heat capacity of an Einstein solid
• 1909 - Constantin Carathéodory develops an axiomatic system of thermodynamics.
• 1910 - Albert Einstein and Marian Smoluchowski find the Einstein-Smoluchowski formula for the attenuation coefficient due to density fluctuations in a gas.
• 1912 - Peter Debye gives an improved heat capacity estimate by allowing low-frequency phonons
• 1916 - Sydney Chapman and David Enskog systematically develop the kinetic theory of gases.
• 1916 - Albert Einstein considers the thermodynamics of atomic spectral lines and predicts stimulated emission
• 1919 - James Jeans discovers that the dynamical constants of motion determine the distribution function for a system of particles
• 1920 - Meghnad Saha states his ionization equation
• 1923 - Peter Debye and Erich Huckel publish a statistical treatment of the dissociation of electrolytes
• 1924 - Satyendra Nath Bose introduces Bose-Einstein statistics, in a paper translated by Einstein
• 1926 - Enrico Fermi and Paul Dirac introduce Fermi-Dirac statistics for fermions
• 1927 - John von Neumann introduces the density matrix representation and establishes quantum statistical mechanics.
• 1928 - J.B. Johnson discovers Johnson noise in a resistor
• 1928 - Harry Nyquist derives the fluctuation-dissipation relationship for a resistor to explain Johnson noise
• 1929 - Lars Onsager derives the Onsager reciprocal relations
• 1942 - J.L. Doob states his theorem on Gauss-Markov processes
• 1944 - Lars Onsager gives an analytic solution to the 2D Ising model including its phase transition

1945-present

• 1948 - Claude Elwood Shannon establishes information theory.
• 1957 - A.S. Kompaneets derives his Compton scattering Fokker-Planck equation.
• 1957 - Ryogo Kubo derives the first of the Green-Kubo relations for linear transport coefficients.
• 1957 - Edwin T. Jaynes gives MaxEnt interpretation of thermodynamics from information theory.
• 1972 - Jacob Bekenstein suggests that black holes have an entropy proportional to their surface area.
• 1974 - Stephen Hawking predicts that black holes will radiate particles with a black-body spectrum which can cause black hole evaporation

See also

• History of physics
• History of thermodynamics
• List of notable textbooks in statistical mechanics
• Physics
• Thermodynamics