Energetics: physics without atoms

1891-1895 Energy and motion theory theory refuted

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A movement in late-19th-century physics that took energy to be the only reality and matter to be merely a form in which it appears. It demanded that physics and chemistry be built directly on thermodynamics, without the hypothesis of atoms.

Its chief bearers were the German physical chemist Wilhelm Ostwald and his countryman Georg Helm. It was a scientific position, not a crank one: it rested on the reliability of the two laws and on a refusal to introduce entities that could not in principle be observed; in various versions it was shared by the Frenchman Pierre Duhem and the Austrian Ernst Mach, while the early Planck was sceptical of atomism.

At the Lübeck meeting of 1895 the Austrian Ludwig Boltzmann defeated the energeticists in open debate, but the question was closed only by the measurements of the early twentieth century. In 1909 Ostwald publicly acknowledged the existence of atoms, naming two grounds: the counting of gaseous ions by J. J. Thomson and the agreement of Brownian movement with the kinetic hypothesis established by Perrin.

Why this date

The lower bound of the label and the axis year follow the first publication, Studien zur Energetik (1891-1892), as dated by the Dictionary of Scientific Biography. The upper bound, 1895, corresponds to the programmatic lecture Die Ueberwindung des wissenschaftlichen Materialismus, delivered at the meeting of German scientists and physicians in Lübeck.

What it grew from

• The two laws of thermodynamics (Clausius 1850, Thomson 1851)

  influenced · Confidence: high

  Ostwald and his allies built energetics on the reliability of thermodynamics: since the two laws work without any hypothesis about the constitution of matter, the atom was declared a superfluous entity.

  Link sources

  • Klodian Coko (rev. of A. Chalmers), Atomism from the 17th to the 20th Century, Stanford Encyclopedia of Philosophy (2026) Verified 20 Sep 2026

    In the late nineteenth century leading scientists such as Ostwald, Duhem and Max Planck were inclined to take thermodynamics as the model of how science should proceed.

  • E. N. Hiebert, H.-G. Körber, Ostwald, Friedrich Wilhelm, Dictionary of Scientific Biography (1978) Verified 20 Sep 2026

    He began seriously to develop his ideas on energetics around 1890, and thereafter gradually reorganized all of his thoughts and work around energy.

  "Verified" means that on that day the quotation was found at the address given, word for word. No date means we have not been able to open the source yet, not that the quotation is wrong.

• Kinetic theory of gases and statistical mechanics

  influenced · Confidence: medium

  The kinetic theory became the main target of energetics: it refused to explain thermal processes through the mechanics of moving molecules, and in 1895 at Lübeck the argument came to an open clash between Ostwald and Boltzmann.

  Dispute: This concerns confrontation, not origin: the sources do not claim that energetics arose as a reaction to the kinetic theory, and they trace Ostwald's motives to the successes of thermodynamics and chemical energetics instead. Mach rejected atoms for different, positivist reasons, and his position did not coincide with Ostwald's energetics.

  Link sources

  • Jos Uffink, Boltzmann's Work in Statistical Physics, Stanford Encyclopedia of Philosophy (2024) Verified 20 Sep 2026

    It resisted attempts to comprehend energy, or these transformations in terms of mechanical pictures.

  • Jos Uffink, Boltzmann's Work in Statistical Physics, Stanford Encyclopedia of Philosophy (2024) Verified 20 Sep 2026

    In the case of Ostwald, and his 'energetics', Boltzmann did become involved in a more heated dispute at a meeting in Lübeck in 1895.

  "Verified" means that on that day the quotation was found at the address given, word for word. No date means we have not been able to open the source yet, not that the quotation is wrong.

Other links

• Brownian motion as a measurement of molecules

  refuted by · Confidence: medium

  The energeticist refusal of atoms was closed by the experiments of the early twentieth century, and in 1909 Ostwald acknowledged the experimental proof of the atomic nature of matter, naming among his grounds the agreement of Brownian movement with the kinetic hypothesis established by Perrin.

  Dispute: Brownian motion was not the only cause. In 1909 Ostwald named two grounds and put the counting of gaseous ions by J. J. Thomson first, that is work from an entirely different field, mentioning Perrin second. The encyclopedia's wording is more cautious than a verdict: it says 'usually considered', reporting the received view of Perrin's decisive role. Mach, unlike Ostwald, never accepted the reality of atoms, so the end of the dispute refers to the scientific community as a whole and not to every one of its participants.

  Link sources

  • W. Ostwald, Grundriss der allgemeinen Chemie, 4th ed., Preface, quoted in Hiebert and Körber, Dictionary of Scientific Biography, vol. 15-16, 464 (1909) Verified 20 Sep 2026

    I am now convinced that we have recently become possessed of experimental evidence of the discrete or grained nature of matter, which the atomic hypothesis sought in vain for hundreds and thousands of years. The isolation and counting of gaseous ions, on the one hand, which have crowned with success the long and brilliant researches of J.J. Thomson, and, on the other, agreement of the Brownian movement with the requirements of the kinetic hypothesis, established by many investigators and most conclusively by J. Perrin, justify the most cautious scientist in now speaking of the experimental proof of the atomic nature of matter.

  • Klodian Coko (rev. of A. Chalmers), Atomism from the 17th to the 20th Century, Stanford Encyclopedia of Philosophy (2026) Verified 20 Sep 2026

    The factor that is usually considered as turning the tables decisively in favour of the atomists is Jean Perrin's experiments on Brownian motion.

  • Jean Baptiste Perrin, Biographical, The Nobel Foundation (1926) Verified 20 Sep 2026

    In this way the discontinuity of matter was proved by him beyond doubt: an achievement rewarded with the 1926 Nobel Prize.

  "Verified" means that on that day the quotation was found at the address given, word for word. No date means we have not been able to open the source yet, not that the quotation is wrong.

Node sources

• E. N. Hiebert, H.-G. Körber, Ostwald, Friedrich Wilhelm, Dictionary of Scientific Biography (1978) Verified 20 Sep 2026

  The science of energetics became a controversial issue as the result of Ostwald's lecture 'Die Ueberwindung des wissenschaftlichen Materialismus,' delivered at the Lübeck meeting of the German Society of Scientists and Physicians in 1895.

• E. N. Hiebert, H.-G. Körber, Ostwald, Friedrich Wilhelm, Dictionary of Scientific Biography (1978) Verified 20 Sep 2026

  In 1891-1892 he set forth his views on the importance of energy in 'Studien zur Energetik.'

• Jos Uffink, Boltzmann's Work in Statistical Physics, Stanford Encyclopedia of Philosophy (2024) Verified 20 Sep 2026

  Roughly speaking, energetics presented a conception of nature that took energy as the most fundamental physical entity, and thus represented physical processes as transformations of various forms of energy. It resisted attempts to comprehend energy, or these transformations in terms of mechanical pictures.

• Stephen G. Brush, History of the Kinetic Theory of Gases (Storia della Scienza, vol. 7, ch. 44) (2004) Verified 20 Sep 2026

  yet it was carelessly brushed aside by skeptics like Ernst Mach and Wilhelm Ostwald, who argued at the end of the century that we still have no convincing evidence for the existence of the atom and should therefore banish it from the elite company of established physical theories.

• W. Ostwald, Grundriss der allgemeinen Chemie, 4th ed., Preface, quoted in Hiebert and Körber, Dictionary of Scientific Biography, vol. 15-16, 464 (1909) Verified 20 Sep 2026

  I am now convinced that we have recently become possessed of experimental evidence of the discrete or grained nature of matter, which the atomic hypothesis sought in vain for hundreds and thousands of years. The isolation and counting of gaseous ions, on the one hand, which have crowned with success the long and brilliant researches of J.J. Thomson, and, on the other, agreement of the Brownian movement with the requirements of the kinetic hypothesis, established by many investigators and most conclusively by J. Perrin, justify the most cautious scientist in now speaking of the experimental proof of the atomic nature of matter.

"Verified" means that on that day the quotation was found at the address given, word for word. No date means we have not been able to open the source yet, not that the quotation is wrong.

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