maxwell's demon
Noun: An imaginary, hypothetical being or device proposed in a thought experiment. It controls a small opening in a partition dividing a gas-filled chamber into two sections. By selectively allowing only fast-moving molecules to pass in one direction and only slow-moving molecules to pass in the other, it could create a temperature difference (one side warmer, the other cooler) without performing work. This result would constitute a decrease in entropy, thereby appearing to violate the second law of thermodynamics.
The term is used primarily in discussions of physics, thermodynamics, and the philosophy of science to illustrate the statistical nature of the second law and the limits of converting heat into work. * The concept of Maxwell's demon was introduced by James Clerk Maxwell in 1867 to challenge the absolute nature of the second law of thermodynamics. * Resolving the paradox of Maxwell's demon required understanding the thermodynamic cost of information acquisition and erasure.
- "to exorcise Maxwell's demon": A phrase used metaphorically to describe the scientific process of resolving a paradox or theoretical challenge, particularly one involving information and thermodynamics.
- Later work by scientists like Leo Szilard and Rolf Landauer helped to exorcise Maxwell's demon by linking information processing to entropy.
- Demon (in this context): Used as a shorthand in technical discussions.
- The demon's operation seems to create a perpetual motion machine of the second kind.
- Szilard engine: A related thought experiment that simplifies the demon's action to a single molecule, clarifying the role of information.
- Information-theoretic thermodynamics: The field of study that developed, in part, from analyzing the Maxwell's demon paradox.
- Thought experiment (though this is the category, not a direct synonym for the specific entity).
- Thermodynamic paradox.
- Second law of thermodynamics: The fundamental physical law that the demon's operation seemingly challenges.
- Entropy: The measure of disorder or randomness that the demon appears to reduce locally.
- Landauer's principle: The principle that erasing information is a dissipative process that increases entropy, a key part of the modern resolution to the paradox.
- an imaginary creature that controls a small hole in a partition that divides a chamber filled with gas into two parts and allows fast molecules to move in one direction and slow molecules to move in the other direction through the hole; this would result in one part of the container becoming warmer and the other cooler, thus decreasing entropy and violating the second law of thermodynamics