Negentropy – Maxwell’s Demon

Negentropy (negative entropy) describes processes in which order increases locally within a system. The concept connects thermodynamics, information theory, and the physics of living systems.

What Is Negentropy?

Negentropy is a measure of increasing or maintaining order, in contrast to entropy which quantifies disorder. The term was popularized by Erwin Schrödinger in his book What Is Life? (1944), where he proposed that living systems sustain themselves by consuming “negative entropy.”

Negentropy does not violate the second law of thermodynamics because local increases in order are balanced by greater entropy production in the environment.

Maxwell’s Demon

Maxwell’s Demon is a famous thought experiment introduced by James Clerk Maxwell (1867). It imagines a tiny being that sorts fast and slow molecules between two chambers, seemingly creating a temperature difference without doing work.

Later work showed that the demon’s information processing (measurement, storage, erasure) requires energy and increases entropy, preserving the second law overall.

Entropy, Information, and Energy

• Szilard’s engine (1929): Information has energetic consequences.
• Landauer’s principle (1961): Erasing information dissipates heat.

These results imply:

• Information is physical,
• Entropy and information are deeply connected,
• Negentropy requires interaction with the environment.

Negentropy in Living Systems

• Living organisms maintain high internal order,
• They exchange energy and matter continuously,
• They export entropy while preserving structure.

Metabolism can be interpreted as a process that consumes energy, processes information, and maintains coherence.

Modern Experimental Studies

• Colloidal particles
• Optical traps
• Single-electron devices

These experiments demonstrate that information can be converted into work while respecting thermodynamics.

Conceptual Importance

• Entropy relates to information, not only heat,
• Feedback and measurement control physical systems,
• Local order can arise if compensated globally.

Relevance to Informational Models

• Coherence as an organizing principle,
• Field-based and wave-based entropy control,
• Time and information in complex systems.

Note: These interpretations are theoretical and not yet part of standard physics.

References

Maxwell’s Demon – Encyclopaedia Britannica
https://www.britannica.com/science/Maxwells-demon

Entropy and Information – Stanford Encyclopedia of Philosophy
https://plato.stanford.edu/entries/information-entropy/

Landauer’s principle, reversible computation and Maxwell’s Demon – IBM Research (C. H. Bennett)
https://research.ibm.com/publications/notes-on-landauers-principle-reversible-computation-and-maxwells-demon

Experimental realization of Maxwell’s Demon – Nature Physics
https://www.nature.com/articles/nphys3026

What Is Life? – Erwin Schrödinger (Cambridge University Press)
https://www.cambridge.org/core/books/what-is-life/A876185F2DB06FF5C2CC67C9A60DAD7F