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integrated circuit

(Encyclopedia)integrated circuit (IC), electronic circuit built on a semiconductor substrate, usually one of single-crystal silicon. The circuit, often called a chip, is packaged in a hermetically sealed case or a ...

interval

(Encyclopedia)interval, in music, the difference in pitch between two tones. Intervals may be measured acoustically in terms of their vibration numbers. They are more generally named according to the number of step...

micrometer

(Encyclopedia)micrometer mīkrŏmˈətər, mīˈkrōmēˌtər [key]. 1 Instrument used for measuring extremely small distances. Typical examples are devices used in astronomical telescopes to measure the apparent d...

indium

(Encyclopedia)indium ĭnˈdēəm [key], a metallic chemical element; symbol In; at. no. 49; at. wt. 114.818; m.p. 156.6℃; b.p. about 2,080℃; sp. gr. 7.31 at 20℃; valence +1, +2, or +3. Indium is a soft, malle...

London Symphony Orchestra

(Encyclopedia)London Symphony Orchestra (LSO), founded 1904 by musicians who had left the Queen's Hall Orchestra. Established as a self-governing, profit-sharing cooperative, with members selecting the conductors, ...

Vienna Philharmonic

(Encyclopedia)Vienna Philharmonic, symphony orchestra in Vienna, Austria, founded 1842 and based at the Weiner Musikverein. The orchestra is a self-governing institution whose members are selected exclusively from ...

Partch, Harry

(Encyclopedia)Partch, Harry, 1901–74, American composer, b. Oakland, Calif. Highly individualistic and largely self-taught, Partch rejected many of the traditions of Western music. He developed a theory of “cor...

gas laws

(Encyclopedia)gas laws, physical laws describing the behavior of a gas under various conditions of pressure, volume, and temperature. Experimental results indicate that all real gases behave in approximately the sa...

tone

(Encyclopedia)tone. In music, a tone is distinguished from noise by its definite pitch, caused by the regularity of the vibrations which produce it. Any tone possesses the attributes of pitch, intensity, and qualit...

magnitude

(Encyclopedia)magnitude, in astronomy, measure of the brightness of a star or other celestial object. The stars cataloged by Ptolemy (2d cent. a.d.), all visible with the unaided eye, were ranked on a brightness sc...