 The development of thermodynamics in the nineteenth century fundamentally altered philosophical conceptions of matter. The first and second laws of thermodynamics—energy conservation and entropy increase—revealed a universe governed by dynamic energy exchanges rather than static mechanics. However, these laws appeared to predict the cosmos’s inevitable exhaustion, culminating in a final equilibrium or ‘heat death.’ Friedrich Engels challenged this fatalistic interpretation, arguing that it misrepresented the significance of energy. Engels, adopting a dialectical perspective, reinterpreted thermodynamics as a philosophy of production rather than decline, viewing energy as the dialectical pulse of matter that unites conservation and transformation. In Dialectics of Nature (1873–1886), Engels aimed to incorporate contemporary scientific discoveries into Marxist materialism. (Engels, 1883) He interpreted the first law of thermodynamics as evidence of the ‘indestructibility of motion’ and the second law as revealing the irreversible transformation of forms. Collectively, these laws embodied the dialectical unity of constancy and change. Engels contended that energy is not a static quantity but the ‘self-activity of matter,’ a continuous process of conversion among physical forms such as heat, motion, and electricity. As Engels asserted, ‘motion itself is a contradiction’: ‘rest and motion, identity and difference, are inseparable.’ (“Anti-Dialectics: Motion as a Contradiction,” n.d.) Thus, energy embodied dialectics itself: it both conserved and transformed, negated and renewed. The apparent entropy observed in physical systems did not signify universal decay but instead revealed nature’s historical dynamism. In opposition to the mechanistic ‘heat death’ hypothesis proposed by Clausius and Kelvin, Engels argued that energy dissipation in one region invariably generates new gradients elsewhere. (“Materialism and the Dialectical Method,” n.d.) Nature, in this framework, is not a closed system tending toward equilibrium but an open, infinite totality engaged in continual self-renewal. Entropy, therefore, represents a temporary moment of negation within a broader cycle of regeneration. Engels’s approach thereby historicized the concept of energy, framing it not as a metaphysical substance but as the medium of transformation connecting inorganic and organic processes. In Dialectics of Nature, he extended this logic to encompass life and thought, positing that the energy of living beings signifies the transformation, rather than the abolition, of physical energy. (Engels, 1883) Consciousness, in this view, emerges from the dialectical movement of energy through matter, culminating in labour and social production. Consequently, human history is continuous with natural energetics; the transformation of energy in labour mirrors transformations of energy in the physical world. For Engels, both natural and social production constitute energetic processes of negation and renewal (Zwart, 2022). A century later, Engels’s proposition reemerges in the work of Deleuze, though in a transformed context. Like Engels, Deleuze rejects the interpretation of thermodynamics as a science of depletion and instead conceptualises energy as the fundamental principle of production. However, Deleuze reframes this energetic materialism not in dialectical terms but as a differential field of intensities that continuously generate new forms. While Deleuze also treats energy as a principle of production, he departs from Engels’s dialectical framework of negation. In Difference and Repetition (1968), Deleuze differentiates between extensive and intensive magnitudes. Extensive quantities, such as mass, volume, and temperature, characterise stable, measurable states, whereas intensive magnitudes, including pressure, potential, and difference, define the gradients that drive change. In this framework, energy is not primarily a conserved quantity but a magnitude that differentiates. It serves as the source of individuation, described as ‘the difference which is the sufficient reason of all phenomena.’ (Deleuze, 1994) Deleuze thereby transforms the thermodynamic concept of energy into a metaphysics of difference. While classical thermodynamics views energy as tending toward equilibrium, Deleuze conceptualises the universe as sustained by non-equilibrium, maintained through the productive tension of intensities. In this perspective, entropy does not symbolise decay but instead signifies the redistribution of potential across the field of difference. Dissipation becomes a precondition for novelty, as each expenditure of energy generates new gradients and possibilities for transformation. For Deleuze, energy is not a unity or totality but a multiplicity. It does not reconcile opposites but proliferates differences. His ontology of energy rejects both the mechanistic model of closed systems and the dialectical model of cyclical synthesis. The world is a field of immanent production, a ‘plane of consistency’ on which intensities continually recombine without ultimate equilibrium. In this way, Deleuze offers a radical rethinking of energy. Life and thought are not exceptional forms of organisation but expressions of the same energetic creativity that pervades matter. The human subject becomes one configuration among many in a universal process of production. As he and Guattari put it, ‘production is everywhere … it is the production of production itself’. Energy is the material and affective substance of this production: the movement of desire, matter, and difference. Engels and Deleuze both advocate for a non-mechanistic interpretation of energy, yet they fundamentally diverge in their respective conceptualisations. For Engels, energy embodies the unity of opposites within a totality—conservation and transformation, being and becoming—thereby ensuring both the permanence of matter and its historical development. In contrast, Deleuze conceives of energy as differential rather than dialectical; it possesses only variations, not opposites. Its transformations do not return to unity but instead open new trajectories of becoming. Deleuze’s differential ontology interprets production as the immanent creativity of energy, dissolving boundaries between human and non-human activity and privileging the discontinuity. The contemporary relevance of Engels and Deleuze is evident in their ecological implications. Engels’s focus on the interdependence of natural and social energetics anticipates ecological systems theory, which conceptualises the biosphere as a network of energy exchanges and feedback mechanisms. His critique of the ‘heat death’ hypothesis aligns with current rejections of linear models of ecological collapse, instead proposing that diffusion and renewal coexist within the planetary cycles. Deleuze’s perspective is grounded in ‘corrected vitalism,’ which regards life as an emergent property of energetic differentiation. His conception of energy as creative intensity parallels contemporary theories of self-organisation and non-equilibrium dynamics. Isabelle Stengers later characterised Deleuze’s metaphysics as a ‘cosmology of becoming,’ where the irreversibility of energy is not a tragedy but a precondition for invention. (Prigogine & Stengers, 1984) Consistent with Engels, Deleuze maintains that the planet is not a passive system but a field of production. Engels and Deleuze each transform the physics of energy into a philosophy of production, albeit through distinct frameworks. Engels interprets energy dialectically: it conserves through transformation and negates through renewal. Thus, every apparent loss or dissipation is integrated into a broader cycle of regeneration, with energy embodying the rhythm of contradiction and resolution. In contrast, Deleuze conceptualises energy as the effect of difference, produced by divergence and dissipated. Rather than returning to unity, each expenditure of energy initiates new trajectories of differentiation, so that what appears as loss from a thermodynamic perspective becomes, in Deleuze’s terms, the very condition for the emergence of new forms. In short, Engels and Deleuze refute the image of energy as exhaustion and instead affirm it as the power of creation. In this sense, they offer two complementary responses to the thermodynamic imagination: Engels’s energy of contradiction and Deleuze’s energy of intensity. Each reveals that the cosmos is not condemned to entropy but animated by it, that energy, far from dwindling into equilibrium, is the world’s capacity to make itself anew. References Engels, F. (1883). Dialectics of Nature. Progress Publishers. https://www.marxists.org/archive/marx/works/1883/don/index.htm “Anti-Dialectics: Motion as a Contradiction.” https://www.anti-dialectics.co.uk/page%2008_03.htm “Materialism and the Dialectical Method.” https://leninists.org/images/1/1a/Materialism_and_the_Dialectical_Method.pdf Engels, F. (1883). Dialectics of Nature. Chapter 1: Introduction. https://www.marxists.org/archive/marx/works/1883/don/don.pdf Zwart, H. (2022). “Dialectical Materialism” in Continental Philosophy of Technoscience. Springer Nature Link. https://link.springer.com/chapter/10.1007/978-3-030-84570-4_3 Deleuze, G. (1994). Difference and Repetition. p. 222. https://www.amazon.com/Difference-Repetition-Gilles-Deleuze/dp/0231052130 Prigogine, I. & Stengers, I. (1984). Order Out of Chaos: Man’s New Dialogue with Nature. Publisher: Bantam Books. https://www.amazon.com/Order-Out-Chaos-Dialogue-Nature/dp/0553342530 Originally published on Alex Taek-Gwang Lee's Substack Author Alex Taek-Gwang Lee is a writer moonlighting as a philosophy and cultural studies professor in South Korea. Archives May 2026
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