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uncertainty principle

(Encyclopedia)uncertainty principle, physical principle, enunciated by Werner Heisenberg in 1927, that places an absolute, theoretical limit on the combined accuracy of certain pairs of simultaneous, related measur...

common-ion effect

(Encyclopedia)common-ion effect, decrease in solubility of an ionic salt, i.e., one that dissociates in solution into its ions, caused by the presence in solution of another solute that contains one of the same ion...

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 ...

principle of indeterminacy

(Encyclopedia)principle of indeterminacy: see uncertainty principle. ...

Duan, Le

(Encyclopedia)Duan, Le: see Le Duan.

Creusot, Le

(Encyclopedia)Creusot, Le lə krözōˈ [key], city, Saône-et-Loire dept., E central France, in Burgundy. ...

Havre, Le

(Encyclopedia)Havre, Le lə äˈvrə [key], city, Seine-Maritime dept., N France, in Normandy, at the mouth of ...

Mans, Le

(Encyclopedia)Mans, Le lə mäN [key], city (1990 pop. 148,465), capital of Sarthe dept., NW France, on the Sarthe River. The historical capital of Maine, it is also an important manufacturing, commercial, educatio...

Le Moyne

(Encyclopedia)Le Moyne lə mwän [key], Canadian family. It was founded by Charles le Moyne, sieur de Longueuil, whose 11 sons were noted soldiers, explorers, and colonizers. The two most famous sons were the sieur...