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Kelvin temperature scale

(Encyclopedia)Kelvin temperature scale, a temperature scale having an absolute zero below which temperatures do not exist. Absolute zero, or 0K, is the temperature at which molecular energy is a minimum, and it c...

Stirling engine

(Encyclopedia)Stirling engine, an external combustion reciprocating engine having an enclosed working fluid that is alternately compressed and expanded to operate a piston, thus converting heat from a variety of so...

conservation laws

(Encyclopedia)conservation laws, in physics, basic laws that together determine which processes can or cannot occur in nature; each law maintains that the total value of the quantity governed by that law, e.g., mas...

Glashow, Sheldon Lee

(Encyclopedia)Glashow, Sheldon Lee glăshˈō [key], 1932–, American physicist, b. New York City, Ph.D. Harvard, 1959. He became a professor at the Univ. of California at Berkeley in 1961 before moving to Harvard...

Lavrov, Sergey Viktorovich

(Encyclopedia)Lavrov, Sergey Viktorovich, 1950– Russian and Soviet diplomat, b. Moscow, grad. Moscow State Institute of International Relations, 1972. He began his career in the Soviet foreign service, working in...

Lawrence, Ernest Orlando

(Encyclopedia)Lawrence, Ernest Orlando, 1901–58, American physicist, b. Canton, S. Dak., grad. Univ. of South Dakota, 1922, Ph.D. Yale, 1925. Affiliated with the Univ. of California from 1928 onward, he became a ...

York, city, United States

(Encyclopedia)York, city (1990 pop. 42,192), seat of York co., SE Pa., on Codorus Creek, in an agricultural area; laid out 1741, inc. as a city 1887. It is a market, trade, processing, and distribution center in th...

Strong, William Duncan

(Encyclopedia)Strong, William Duncan, 1899–1962, American anthropologist, b. Portland, Oreg., grad. Univ. of California (B.A., 1923; Ph.D., 1926). He served as curator at the Chicago Field Museum (1926–29) and ...

Van de Graaff, Robert Jemison

(Encyclopedia)Van de Graaff, Robert Jemison văn də gräf [key], 1901–67, American physicist, b. Tuscaloosa, Ala., grad. Univ. of Alabama (B.S., 1922), Ph.D. Oxford, 1928. He was research associate at Massachuse...

Philippe, Édouard Charles

(Encyclopedia)Philippe, Édouard Charles, 1970–, French lawyer and political leader, b. Rouen, grad. Paris Institute of Political Studies, 1992, National School of Administration, 1997. He worked as a lawyer for ...