minute particles
31Brown, Robert — born Dec. 21, 1773, Montrose, Angus, Scot. died June 10, 1858, London, Eng. Scottish botanist. The son of a clergyman, he studied medicine in Aberdeen and Edinburgh before entering the British army as an ensign and assistant surgeon (1795). He… …
32Brownian movement — n. (also Brownian motion) Physics the erratic random movement of microscopic particles in a liquid, gas, etc., as a result of continuous bombardment from molecules of the surrounding medium. Etymology: R. Brown, Sc. botanist d. 1858 * * * noun… …
33Uranus — This article is about the planet. For other uses, see Uranus (disambiguation). Uranus   …
34Soil structure — is determined by how individual soil granules clump or bind together and aggregate, and therefore, the arrangement of soil pores between them. Soil structure has a major influence on water and air movement, biological activity, root growth and… …
35tunneling — tun·nel·ing (tŭnʹə lĭng) n. In quantum mechanics, the passing of a particle through a seemingly impenetrable barrier without a cause that is explainable by classical physics. * * * or barrier penetration In physics, the passage of a particle… …
36loess — loessial, loessal, adj. /loh es, les, lus/, n. a loamy deposit formed by wind, usually yellowish and calcareous, common in the Mississippi Valley and in Europe and Asia. [1825 35; < G Löss < Swiss G lösch loose, slack (sch taken as a dial.… …
37chemical industry — Introduction complex of processes, operations, and organizations engaged in the manufacture of chemicals and their derivatives. Although the chemical industry may be described simply as the industry that uses chemistry and… …
38Perrin, Jean — ▪ French physicist in full Jean Baptiste Perrin born Sept. 30, 1870, Lille, France died April 17, 1942, New York, N.Y., U.S. French physicist who, in his studies of the Brownian motion of minute particles suspended in liquids, verified Albert… …
39Photoelectric effect — The photoelectric effect is a quantum electronic phenomenon in which electrons are emitted from matter after the absorption of energy from electromagnetic radiation such as x rays or visible light.cite book | title = Physics for Scientists… …
40kinetic theory — noun Date: 1864 either of two theories in physics based on the fact that the minute particles of a substance are in vigorous motion: a. a theory that the temperature of a substance increases with an increase in either the average kinetic energy… …
