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neutralization

(Encyclopedia)neutralization, chemical reaction, according to the Arrhenius theory of acids and bases, in which a water solution of acid is mixed with a water solution of base to form a salt and water; this reactio...

Sommerfeld, Arnold Johannes Wilhelm

(Encyclopedia)Sommerfeld, Arnold Johannes Wilhelm ärˈnōlt yōhänˈəs vĭlˈhĕlm zômˈərfĕlt [key], 1868–1951, German physicist and teacher. He received a Ph.D. at Königsburg Univ. in 1891 and was a prof...

relativity

(Encyclopedia)relativity, physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of reference. One consequ...

Downing, Andrew Jackson

(Encyclopedia)Downing, Andrew Jackson, 1815–52, American horticulturist, rural architect, and landscape gardener, b. Newburgh, N.Y. With his brother Charles Downing, 1802–85, he took over the operation of the n...

guild socialism

(Encyclopedia)guild socialism, form of socialism developed in Great Britain that advocated a system of industrial self-government through national worker-controlled guilds. The theory, as originated by Arthur J. Pe...

Laurent, Auguste

(Encyclopedia)Laurent, Auguste ōgüstˈ lōräNˈ [key], 1808–53, French organic chemist. He devised a systematic nomenclature for organic chemistry. His studies on naphthalene and its chlorination products led ...

periodic law

(Encyclopedia)periodic law, statement of a periodic recurrence of chemical and physical properties of the elements when the elements are arranged in order of increasing atomic number. Such an arrangement in the for...

ether, in physics and astronomy

(Encyclopedia)ether or aether, in physics and astronomy, a hypothetical medium for transmitting light and heat (radiation), filling all unoccupied space; it is also called luminiferous ether. In Newtonian physics a...

Gerhardt, Charles Frédéric

(Encyclopedia)Gerhardt, Charles Frédéric shärl frādārēkˈ zhārärˈ [key], 1816–56, French chemist, b. Strasbourg. He revived the theory of acid radicals, which he called the theory of residues, and did va...

Lucas, Robert Emerson, Jr.

(Encyclopedia)Lucas, Robert Emerson, Jr., 1937–2023, American economist, b. Yakima, Wash., Ph.D. Univ. of Chicago, 1964. Lucas taught at Carnegie Mellon Univ. (1963...