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ALLOTROPISM - Definiția din dicționar

Traducere: română


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{ Al*lot"ro*pism (&unr_;), Al*lot"ro*py (&unr_;), } n. [Gr. &unr_; other + direction, way, &unr_; to turn: cf. F. allotropie.] (Chem.) The property of existing in two or more conditions which are distinct in their physical or chemical relations.
[1913 Webster]

&hand_; Thus, carbon occurs crystallized in octahedrons and other related forms, in a state of extreme hardness, in the diamond; it occurs in hexagonal forms, and of little hardness, in black lead; and again occurs in a third form, with entire softness, in lampblack and charcoal. In some cases, one of these is peculiarly an active state, and the other a passive one. Thus, ozone is an active state of oxygen, and is distinct from ordinary oxygen, which is the element in its passive state.
[1913 Webster]