subatomic
51standard model — In physics, the combination of two theories of particle physics into a single framework to describe all interactions of subatomic particles except those due to gravity (see gravitation). The two theories, the electroweak theory and the theory of… …
52Atomic theory — Atomic model redirects here. For the unrelated term in mathematical logic, see Atomic model (mathematical logic). This article is about the historical models of the atom. For a history of the study of how atoms combine to form molecules, see… …
53Quantum mechanics — For a generally accessible and less technical introduction to the topic, see Introduction to quantum mechanics. Quantum mechanics …
54hyperon — /huy peuh ron /, n. Physics. any baryon with strangeness other than zero, esp. one with a relatively long lifetime. [1950 55; HYPER + ON1] * * * ▪ subatomic particle quasi stable member of a class of subatomic particles (subatomic particle) …
55neutron — /nooh tron, nyooh /, n. Physics. an elementary particle having no charge, mass slightly greater than that of a proton, and spin of 1/2: a constituent of the nuclei of all atoms except those of hydrogen. Symbol: n [1920 25; NEUTR(O) + ON1] * * *… …
56quantum field theory — Physics. any theory in which fields are treated by the methods of quantum mechanics; each field can then be regarded as consisting of particles of a particular kind, which may be created and annihilated. [1945 50] * * * Theory that brings quantum …
57uncertainty principle — Physics. the principle of quantum mechanics, formulated by Heisenberg, that the accurate measurement of one of two related, observable quantities, as position and momentum or energy and time, produces uncertainties in the measurement of the other …
58W particle — Physics. either of two types of charged intermediate vector bosons, one having a positive charge and the other a negative charge. Symbols: W+, W [1970 75; appar. for weak] * * * Electrically charged subatomic particle that transmits the weak… …
59physical science, principles of — Introduction the procedures and concepts employed by those who study the inorganic world. physical science, like all the natural sciences, is concerned with describing and relating to one another those experiences of the surrounding… …
60Atom — The atom is the smallest unit of an element that retains the chemical properties of that element. An atom has an electron cloud consisting of negatively charged electrons surrounding a dense nucleus. The nucleus contains positively charged… …
