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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...Midwest City
(Encyclopedia)Midwest City, city (1990 pop. 52,267), Oklahoma co., central Okla., a residential suburb of Oklahoma City; founded 1942 with the activation of adjoining Tinker Air Force Base, a logistics center. The ...Horta
(Encyclopedia)Horta hôrˈtə, Port. ôrˈtə [key], town, capital of Horta dist., in the Azores, Portugal, on Faial island. It has...Earth Day
(Encyclopedia)Earth Day, Apr. 22, a day to celebrate the environment. The first Earth Day was organized in 1970 to promote the ideas of ecology, encourage respect for life on earth, and highlight growing concern ov...Cypress, city, United States
(Encyclopedia)Cypress sīˈprəs [key], city (2020 pop. 50,151), Orange co., S Calif. near Long Beach; inc. ...cooling system
(Encyclopedia)cooling system: see air conditioning; internal-combustion engine; refrigeration. ...Rio Branco
(Encyclopedia)Rio Branco, city (1996 pop. 228,907), capital of Acre state, NW Brazil, on the Acre River. Rubber and Brazil nuts are its chief products; there is also some farming. Rio Branco has air connections wit...North Las Vegas
(Encyclopedia)North Las Vegas, city (1990 pop. 47,707), Clark co., SE Nev., a residential suburb of Las Vegas; inc. 1946. Tourism is the economic mainstay of this growing suburb. The city's population more than tri...O'Toole, Erin Michael
(Encyclopedia)O'Toole, Erin Michael, 1973–, Canadian politician. He served in the Royal Canadian Air Force (1991–2000), then earned a law degree and practised corporate law. A member of the Conservative party, ...Black, Joseph
(Encyclopedia)Black, Joseph, 1728–99, Scottish chemist and physician, b. France. He was professor of chemistry at Glasgow (1756–66) and from 1766 at Edinburgh. He is best known for his theories of latent heat a...Browse by Subject
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