Columbia Encyclopedia

Search results

500 results found

McNaughton, Andrew George Latta

(Encyclopedia)McNaughton, Andrew George Latta məknôtˈən [key], 1887–1966, Canadian general, b. Saskatchewan. An artillery officer in World War I, he was later (1929–35) Canadian chief of staff. In World War...

atomic weight

(Encyclopedia)atomic weight, mean (weighted average) of the masses of all the naturally occurring isotopes of a chemical element, as contrasted with atomic mass, which is the mass of any individual isotope. Althoug...

atomic mass

(Encyclopedia)atomic mass, the mass of a single atom, usually expressed in atomic mass units (amu). Most of the mass of an atom is concentrated in the protons and neutrons contained in the nucleus. Each proton or n...

atomic number

(Encyclopedia)atomic number, often represented by the symbol Z, the number of protons in the nucleus of an atom, as well as the number of electrons in the neutral atom. Atoms with the same atomic number make up a c...

Baruch, Bernard Mannes

(Encyclopedia)Baruch, Bernard Mannes bəro͞okˈ [key], 1870–1965, U.S. financier and government adviser, b. Camden, S.C. He grew rich through stockmarket speculation before he was 30. In World War I he advised o...

International Fund for Agricultural Development

(Encyclopedia)International Fund for Agricultural Development(IFAD), specialized agency of the United Nations with headquarters in Rome, Italy. IFAD grew out of the 1974 World Food Conference; it was established in...

International Trade Commission, United States

(Encyclopedia)International Trade Commission, United States, independent agency of the U.S. government established in 1916 as the Tariff Commission; renamed International Trade Commission in 1975. It is charged wit...

European Space Agency

(Encyclopedia)European Space Agency (ESA), multinational agency dedicated to the promotion, for exclusively peaceful purposes, of cooperation among European states in space research and technology. Member states in...

International

(Encyclopedia)International, any of a succession of international socialist and Communist organizations of the 19th and 20th cent. After World War I, the Second International was revived (1919) by moderate social...

Oppenheimer, J. Robert

(Encyclopedia)Oppenheimer, J. Robert ŏpˈənhīˌmər [key], 1904–67, American physicist, b. New York City, grad. Harvard (B.A., 1925), Ph.D. Univ. of Göttingen, 1927. He taught at the Univ. of California and t...