(Encyclopedia) Ribot, ThéoduleRibot, Théodulerēbōˈ [key], 1839–1916, French psychologist. He was professor of experimental psychology at the Sorbonne and later at the Collège de France. His many…
(Encyclopedia) artesian well, deep drilled well through which water is forced upward under pressure. The water in an artesian well flows from an aquifer, which is a layer of very porous rock or…
(Encyclopedia) melting point, temperature at which a substance changes its state from solid to liquid. Under standard atmospheric pressure different pure crystalline solids will each melt at a…
(Encyclopedia) Moore's Law, a projection of semiconductor manufacturing trends made by Gordon E. Moore, cofounder of the Intel Corp., in a 1965 magazine article. He observed that the number of…
(Encyclopedia) division, fundamental operation in arithmetic; the inverse of multiplication. Division may be indicated by the symbol ÷, as in 15 ÷ 3, or simply by a fraction, 15/3. The number that is…
(Encyclopedia) common-ion effect, decrease in solubility of an ionic salt, i.e., one that dissociates in solution into its ions, caused by the presence in solution of another solute that contains one…
(Encyclopedia) hostage, person held by another as a guarantee that certain actions or promises will or will not be carried out. During periods of internal turmoil, insurgents often seize hostages;…
(Encyclopedia) convection, mode of heat transfer in fluids (liquids and gases). Convection depends on the fact that, in general, fluids expand when heated and thus undergo a decrease in density (…
(Encyclopedia) Jehovah's Witnesses, Christian group originating in the United States at the end of the 19th cent., organized by Charles Taze Russell, whose doctrine centers on the Second Coming of…
(Encyclopedia) bedbug, any of the small, blood-sucking bugs of the family Cimicidae, which includes about 30 species distributed throughout the world. Bedbugs are flat-bodied, oval, reddish brown,…
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