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europium

(Encyclopedia)europium yo͝orōˈpēəm [key] [from Europe], metallic chemical element; symbol Eu; at. no. 63; at. wt. 151.964; m.p. about 820℃; b.p. about 1,600℃; sp. gr. 5.25 at 25℃; valence +2 or +3. Europ...

hydrogen fluoride

(Encyclopedia)hydrogen fluoride, chemical compound, HF, a colorless, fuming liquid or colorless gas that boils at 19.54℃. It is miscible with water and is soluble in benzene, toluene, and concentrated sulfuric ac...

Homestead

(Encyclopedia)Homestead. 1 City (2020 pop. 80,737), Dade co., SE Fla.; inc. 1913. A large Miami suburb with a growing Hispanic population, Homestead is a trade ...

Alvarez, Luis Walter

(Encyclopedia)Alvarez, Luis Walter, 1911–88, American physicist, b. San Francisco, grad. Univ. of Chicago, 1932, Ph.D. 1936. He was awarded the 1968 Nobel Prize in Physics for his discovery of a large number of r...

Morgenthau, Hans Joachim

(Encyclopedia)Morgenthau, Hans Joachim, 1904–80, American political scientist and foreign policy analyst, b. Coburg, Germany. After studying at the universities of Frankfort and Munich, he attended the Graduate I...

Meitner, Lise

(Encyclopedia)Meitner, Lise lēˈzə mītˈnər [key], 1878–1968, Austrian-Swedish physicist and mathematician. She was professor at the Univ. of Berlin (1926–33). A refugee from Germany after 1938, she became ...

Pearson, Lester Bowles

(Encyclopedia)Pearson, Lester Bowles, 1897–1972, Canadian diplomat and political leader, b. Ontario prov. He served in the Canadian army in World War I. Pearson taught history at the Univ. of Toronto from 1924 to...

Laird, Melvin Robert

(Encyclopedia)Laird, Melvin Robert, 1922–2016, American politician, U.S. secretary of defense (1969–73), b. Omaha, Nebr. After serving (1942–46) in the navy during World War II, he entered politics as a Repub...

plasma

(Encyclopedia)plasma, in physics, fully ionized gas of low density, containing approximately equal numbers of positive and negative ions (see electron and ion). It is electrically conductive and is affected by magn...

Cai Guo-Qiang

(Encyclopedia)Cai Guo-Qiang, 1957–, Chinese painter and a sculptor especially known for using gunpowder as a medium and explosions and fireworks as means of artistic expression, b. Quanzhou, Fujian prov., studied...