Polymorphic Phase Transitions in Liquids and Glasses

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Science  17 Jan 1997:
Vol. 275, Issue 5298, pp. 322-323
DOI: 10.1126/science.275.5298.322

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Fluids such as liquids and glasses are not usually thought of as possessing distinct forms or phases. As Poole et al. discuss in their Perspective, recent results show that liquids can exhibit “polymorphism”—different phases characterized by different densities.