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Le Châtelier's principle

(Encyclopedia)Le Châtelier's principle, chemical principle that states that if a system in equilibrium is disturbed by changes in determining factors, such as temperature, pressure, and concentration of components...

principle of indeterminacy

(Encyclopedia)principle of indeterminacy: see uncertainty principle. ...

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 ...

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...

Monroe Doctrine

(Encyclopedia)Monroe Doctrine, principle of American foreign policy enunciated in President James Monroe's message to Congress, Dec. 2, 1823. It initially called for an end to European intervention in the Americas,...

Gagern, Heinrich, Freiherr von

(Encyclopedia)Gagern, Heinrich, Freiherr von hīnˈrĭkh frīˈhĕr fən gäˈgərn [key], 1799–1880, German statesman. A Hessian parliamentary leader and leading advocate of German unity, he became (1848) presid...