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day
(Encyclopedia) day, period of time for the earth to rotate once on its axis. The ordinary day, or solar day, is measured relative to the sun, being the time between successive passages of the sun…hour angle
(Encyclopedia) hour angle, in astronomy, a coordinate in the equatorial coordinate system. The hour angle of a celestial body is the angular distance, expressed in hours, minutes, and seconds (one…combining weight
(Encyclopedia) combining weight, the proportion (by weight) in which a chemical element combines with other elements to form compounds. The determination of combining weights was a very important…complementarity principle
(Encyclopedia) complementarity principle, physical principle enunciated by Niels Bohr in 1928 stating that certain physical concepts are complementary. If two concepts are complementary, an…Delambre, Jean Baptiste Joseph
(Encyclopedia) Delambre, Jean Baptiste JosephDelambre, Jean Baptiste JosephzhäN bätēstˈ zhôzĕfˈ dəläNˈbrə [key], 1749–1822, French astronomer and mathematician. He was a member of the bureau of…parallax
(Encyclopedia) CE5 The trigonometric parallax of a star, expressed by the angle θ, is a measure of its apparent motion against the background of more distant stars as a result of the earth's…Broder, David Salzer
(Encyclopedia) Broder, David Salzer, 1929n–2011, American journalist, b. Chicago Heights, Ill., grad. Univ. of Chicago (1947). Noted for measured and incisive political analysis, Broder worked for…Biot, Jean Baptiste
(Encyclopedia) Biot, Jean BaptisteBiot, Jean BaptistezhäN bätēstˈ byō [key], 1774–1862, French physicist, grad. École Polytechnique (1797). He taught mathematics at Beauvais before becoming (1800)…torsion balance
(Encyclopedia) torsion balance, instrument used to measure small forces. It is based on the principle that a wire or thread resists twisting with a force that is proportional to the stress. The…strength of materials
(Encyclopedia) strength of materials, measurement in engineering of the capacity of metal, wood, concrete, and other materials to withstand stress and strain. Stress is the internal force exerted by…Trending
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