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isomorphism

(Encyclopedia)isomorphism īˌsəmôrˈfĭzəm [key], of minerals, similarity of crystal structure between two or more distinct substances. Sodium nitrate and calcium sulfate are isomorphous, as are the sulfates of...

most-favored-nation clause

(Encyclopedia)most-favored-nation clause (MFN), provision in a commercial treaty binding the signatories to extend trading benefits equal to those accorded any third state. The clause ensures equal commercial oppor...

food preservation

(Encyclopedia)food preservation, methods of preparing food so that it can be stored for future use. Because most foods remain edible for only a brief period of time, people since the earliest ages have experimented...

Bunsen burner

(Encyclopedia)Bunsen burner, gas burner, commonly used in scientific laboratories, consisting essentially of a hollow tube which is fitted vertically around the flame and which has an opening at the base to admit a...

Alembert, Jean le Rond d'

(Encyclopedia)Alembert, Jean le Rond d' zhäN lərôNˈ däläNbĕrˈ [key], 1717–83, French mathematician and philosopher. The illegitimate son of the chevalier Destouches, he was named for the St. Jean le Rond ...

Gresham, Sir Thomas

(Encyclopedia)Gresham, Sir Thomas grĕshˈəm [key], 1519?–1579, English merchant and financier. As the royal financial agent in Antwerp after 1551 he proved himself very able, though his methods were frequently ...

Kearney, Denis

(Encyclopedia)Kearney, Denis kärˈnē [key], 1847–1907, American political agitator, b. Co. Cork, Ireland. He was a sailor and then a San Francisco drayman. When California suffered a depression in 1877, Kearney...

atonality

(Encyclopedia)atonality āˌtōnălˈĭtē [key], in music, systematic avoidance of harmonic or melodic reference to tonal centers (see key). The term is used to designate a method of composition in which the compo...

buoyancy

(Encyclopedia)buoyancy boiˈənsē, bo͞oˈyən– [key], upward force exerted by a fluid on any body immersed in it. Buoyant force can be explained in terms of Archimedes' principle. ...

Ritz, Walter

(Encyclopedia)Ritz, Walter, 1878–1909, Swiss physicist. He taught at the universities of Zürich and Göttingen. Ritz's combination principle, confirmed by later research, stated that the frequencies of spectral ...