Relative Density (or Specific Gravity)

Ratio of the mass of a substance to the mass of an equal volume of a standard substance at a reference temperature. NOTE The standard substance is usually water; the reference temperature is usually 4 °C.

Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards

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