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Answer for the clue "The phenomenon of an element existing in two or more physical forms ", 11 letters:
allotropism

Word definitions for allotropism in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context chemistry English) The ability (of an element) to exist in more than one physical form without change of state.

WordNet Word definitions in WordNet
n. the phenomenon of an element existing in two or more physical forms [syn: allotropy ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Allotropism \Al*lot"ro*pism\, Allotropy \Al*lot"ro*py\, n. [Gr. ? other + direction, way, ? to turn: cf. F. allotropie.] (Chem.) The property of existing in two or more conditions which are distinct in their physical or chemical relations. Note: Thus, carbon ...

Usage examples of allotropism.

According to project directors Bradley McAfee and Lynn Saunders, nonutilizable hydrocarbonaceous substances will be propulsively transferred to stratospheric altitudinal locations, where photochemical decomposition will result in triatomic allotropism and formation of benign bicarbonaceous precipitates.

It is easy to call these changes by the name allotropism, but not the less do they confound our hasty generalizations.

These facts of allotropism have some corollaries connected with them rather startling to us of the nineteenth century.

Perhaps they have not studied the mystery of allotropism in the emotions of the human heart.

It is easy to call these changes by the name allotropism, but not the less do they confound our hasty generalizations.

These facts of allotropism have some corollaries connected with them rather startling to us of the nineteenth century.

Perhaps they have not studied the mystery of allotropism in the emotions of the human heart.