specific gravities

/S P AH0 S IH1 F IH0 K G R AE0 V IH0 T IY0 Z/
noun
  1. 1

    The ratio of the mass of a substance to that of an equal volume of water at 4°C (or to some other reference substance)

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Source: https://en.wiktionary.org/wiki/specific%20gravities, https://en.wiktionary.org/wiki/specific%20gravity