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A eutectic mixture is a mixture of two or more substances with a melting point lower than that for any other mixture of the same substances. In the case of salt and water, the eutectic point is -21.12°C or -6.016°F in a solution of 23.31% salt. For additional information, visit http://antoine.frostburg.edu/chem/senese/101/solutions/faq/why-salt-melts-ice.shtml.
