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Mach number
(Encyclopedia)Mach number mäk [key] [for E. Mach], ratio between the speed of an object and the speed of sound in the medium in which the object is traveling. An airplane that has the velocity of Mach 3.0 is trave...Weston, Edward
(Encyclopedia)Weston, Edward, 1886–1958, American photographer, b. Highland Park, Ill. Weston began to make photographs in Chicago parks in 1902, and his works were first exhibited in 1903 at the Art Institute of...mechanics
(Encyclopedia)mechanics, branch of physics concerned with motion and the forces that tend to cause it; it includes study of the mechanical properties of matter, such as density, elasticity, and viscosity. Mechanics...art
(Encyclopedia)art. The major general surveys on topics in the fine arts are painting; sculpture; drawing; photography, and architecture. See also articles on specific artists, periods, styles, regions, genres, and...I
(Encyclopedia)I, 9th letter of the alphabet. This vowel can be pronounced with a short vowel sound, as the ĭ in sit, or with a long vowel sound, like the ī in ride. The Greek correspondent is iota. J is a formal ...Brown, John, Scottish essayist
(Encyclopedia)Brown, John, 1810–82, Scottish essayist. He was a physician. His writing was collected in Horae Subsecivae (3 vol., 1858–82), which included his unique picture of a dog, Rab and His Friends (1859)...expatriation
(Encyclopedia)expatriation, loss of nationality. Such loss is usually, although not necessarily, voluntary. Generally it applies to those persons who have renounced nationality and citizenship in one country to bec...communications industry
(Encyclopedia)communications industry, broadly defined, the business of conveying information. Although communication by means of symbols and gestures dates to the beginning of human history, the term generally ref...work
(Encyclopedia)work, in physics and mechanics, transfer of energy by a force acting to displace a body. Work is equal to the product of the force and the distance through which it produces movement. Although both fo...ultrasonics
(Encyclopedia)ultrasonics, study and application of the energy of sound waves vibrating at frequencies greater than 20,000 cycles per second, i.e., beyond the range of human hearing. The application of sound energy...Browse by Subject
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