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Melting solid below the freezing point

Researchers have discovered a new phenomenon of so-called metastability in a liquid phase. This state is common in supercooled liquids, which are liquids that cool below the freezing point without turning into a solid or a crystal. These scientists report the first experimental evidence of creating a metastable liquid directly by melting a high-pressure solid crystal of the metal bismuth via a decompression process below its melting point.

(via WSJ)