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exclusion principle
(Encyclopedia)exclusion principle, physical principle enunciated by Wolfgang Pauli in 1925 stating that no two electrons in an atom can occupy the same energy state simultaneously. The energy states, or levels, in ...fermion
(Encyclopedia)fermion fûrˈmēŏnˌ [key]: see elementary particles; exclusion principle; Fermi-Dirac statistics. ...Pauli, Wolfgang
(Encyclopedia)Pauli, Wolfgang vôlfˈgäng pouˈlē [key], 1900–1958, Austro-American physicist, b. Vienna. He studied first with A. Sommerfeld at Munich and then with Niels Bohr at Copenhagen. After lecturing (1...seas, freedom of the
(Encyclopedia)seas, freedom of the, in international law, the principle that outside its territorial waters (see waters, territorial) a state may not claim sovereignty over the seas, except with respect to its own ...Chinese exclusion
(Encyclopedia)Chinese exclusion, policy of prohibiting immigration of Chinese laborers to the United States; initiated in 1882. From the time of the U.S. acquisition of California (1848) there had been a large infl...baryon
(Encyclopedia)baryon bârˈēŏnˌ [key] [Gr.,=heavy], class of elementary particles that includes the proton, the neutron, and a large number of unstable, heavier particles, known as hyperons. From a technical poi...lepton
(Encyclopedia)lepton lĕpˈtŏnˌ [key] [Gr.,=light (i.e., lightweight)], class of elementary particles that includes the electron and its antiparticle, the muon and its antiparticle, the tau and its antiparticle, ...Burlingame, Anson
(Encyclopedia)Burlingame, Anson bûrˈlĭng-gām [key], 1820–70, American diplomat, b. New Berlin, N.Y. He became a lawyer in Boston and later (1855–61) a Congressman. Defeated for reelection, he was made (1861...Archimedes' principle
(Encyclopedia)Archimedes' principle, principle that states that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid. The principle applies to both floating and submerged bo...Mach's principle
(Encyclopedia)Mach's principle mäks [key] [for E. Mach], assertion that the inertial effects of mass are not innate in a body, but arise from its relation to the totality of all other masses, i.e., to the universe...Browse by Subject
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