Columbia Encyclopedia
Search results
500 results found
stellar structure
(Encyclopedia)stellar structure, physical properties of a star and the processes taking place within it. Except for that of the sun, astronomers must draw their conclusions regarding stellar structure on the basis ...electret
(Encyclopedia)electret, solid electrically insulating, or dielectric, material that has acquired a long-lasting electrostatic polarization. Electrets are produced by heating certain dielectric materials to a high t...Wechsler Adult Intelligence Scale
(Encyclopedia)Wechsler Adult Intelligence Scale (WAIS): see psychological tests. ...integrated circuit
(Encyclopedia)integrated circuit (IC), electronic circuit built on a semiconductor substrate, usually one of single-crystal silicon. The circuit, often called a chip, is packaged in a hermetically sealed case or a ...luminosity
(Encyclopedia)luminosity, in astronomy, the rate at which energy of all types is radiated by an object in all directions. A star's luminosity depends on its size and its temperature, varying as the square of the ra...Hansen, James Edward
(Encyclopedia)Hansen, James Edward, 1941–, American astrophysicist and climatologist, b. Denison, Iowa, Ph.D. Univ. of Iowa, 1967. In 1967 he joined the Goddard Institute for Space Studies, and served as director...Richardson, Robert Coleman
(Encyclopedia)Richardson, Robert Coleman, 1937–2013, American physicist, b. Washington, D.C. Ph.D. Duke Univ., 1966. Richardson was a professor at Cornell from 1968 until his death; he was the university's first ...specific heat
(Encyclopedia)specific heat, ratio of the heat capacity of a substance to the heat capacity of a reference substance, usually water. Heat capacity is the amount of heat needed to change the temperature of a unit ma...gallium
(Encyclopedia)gallium gălˈēəm [key], metallic chemical element; symbol Ga; at. no. 31; at. wt. 69.723; m.p. 29.78℃; b.p. 2,403℃; sp. gr. 5.904 at 29.6℃ (solid), 6.095 at 29.8℃ (liquid); valence +2 or +3...micrometer
(Encyclopedia)micrometer mīkrŏmˈətər, mīˈkrōmēˌtər [key]. 1 Instrument used for measuring extremely small distances. Typical examples are devices used in astronomical telescopes to measure the apparent d...Browse by Subject
- Earth and the Environment +-
- History +-
- Literature and the Arts +-
- Medicine +-
- People +-
- Philosophy and Religion +-
-
Places
+-
- Africa
- Asia
- Australia and Oceania
- Britain, Ireland, France, and the Low Countries
- Commonwealth of Independent States and the Baltic Nations
- Germany, Scandinavia, and Central Europe
- Latin America and the Caribbean
- Oceans, Continents, and Polar Regions
- Spain, Portugal, Italy, Greece, and the Balkans
- United States, Canada, and Greenland
- Plants and Animals +-
- Science and Technology +-
- Social Sciences and the Law +-
- Sports and Everyday Life +-
