Specific Gravity
The ratio of the weight of a substance to the weight of an equal volume of distilled water at 4 degrees Centigrade. Water at that temperature has a specific gravity of 1. If the specific gravity of the other substance is greater than 1 it floats in water; if less than 1 it sinks.
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"Specific Gravity", Ohio History Central, July 1, 2005, http://www.ohiohistorycentral.org/entry.php?rec=1237
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