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chemical equation

(Encyclopedia)chemical equation, group of symbols representing a chemical reaction. There are a number of other symbols used in chemical equations. A symbol written above or below the reaction arrow indicates spe...

red lead

(Encyclopedia)red lead, bright red to orange-red powder, also called minium, that is used in the manufacture of storage batteries, lead glass, and red pigments; a paint made with red lead is commonly used to protec...

Frank, Robert

(Encyclopedia)Frank, Robert, 1924–2019, Swiss-American photographer and filmmaker, b. Zürich. He immigrated to the United States in 1947 and became a citizen in 1963. One of the 20th century's most influential p...

annual rings

(Encyclopedia)annual rings, the growth layers of wood that are produced each year in the stems and roots of trees and shrubs. In climates with well-marked alternations of seasons (either cold and warm or wet and dr...

Wilczek, Frank Anthony

(Encyclopedia)Wilczek, Frank Anthony, 1951–, American physicist, b. New York City, Ph.D. Princeton, 1974. Wilczek was a professor at Princeton (1974–80, 1989–2000) and at the Univ. of California, Santa Barbar...

Consumers' Union

(Encyclopedia)Consumers' Union, product testing and rating organization founded (1936) to provide consumers with information and counsel regarding major retail goods and services. Through its monthly Consumer Repor...

coal tar

(Encyclopedia)coal tar, product of the destructive distillation of bituminous coal. Coal tar can be distilled into many fractions to yield a number of useful organic products, including benzene, toluene, xylene, na...

Fujinomiya

(Encyclopedia)Fujinomiya fo͞ojēnōˈmēyä [key], city, Shizuoka prefecture, central Honshu, Japan, at the foot of ...

Nanping

(Encyclopedia)Nanping yänˈ– [key], city (1994 est. pop. 211,700), N central Fujian prov., China, on the upper Min River. An important rail hub, it has expanded from a regional market town to include cement, pap...

parallelogram

(Encyclopedia)parallelogram, closed plane figure bounded by four line segments, or sides, with opposite pairs of sides parallel and equal in length. The rhombus, rectangle, and square are special types of parallelo...