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In physics, a quantum (pl.: quanta) is the minimum amount of any physical entity (physical property) involved in an interaction. Quantum is a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents.
Quantum is a discrete unit of energy, charge, or other physical property that appears in submicroscopic systems. Learn about quantum mechanics, quantum field theory, quantum numbers, and quantum phenomena with Britannica.
- The Editors of Encyclopaedia Britannica
Quantum mechanics is a fundamental theory in physics that describes the behavior of nature at and below the scale of atoms.: 1.1 It is the foundation of all quantum physics, which includes quantum chemistry, quantum field theory, quantum technology, and quantum information science.
Learn the origin, usage, and synonyms of the word quantum, which can mean a small amount of energy, a portion of a magnitude, or a principle of quantum mechanics. See examples of quantum in sentences and related phrases and articles.
Learn what quantum physics is, how it studies matter and energy at the fundamental level, and what phenomena and discoveries it reveals. Explore the origins, principles, mathematics, and observations of quantum science, and how it impacts our understanding of the world.
The world is at some level quantum – but whether quantum physics is the last word about the world remains an open question. Take our expert-led quantum physics course and discover the...
Quantum mechanics. Quantum mechanics is the study of matter and its interactions with energy on the scale of atomic and subatomic particles. By contrast, classical physics explains matter and energy only on a scale familiar to human experience, including the behavior of astronomical bodies such as the moon.
