The procedure of a laboratory specific gravity test. Specific gravity is the ratioof the density of a substance to the density of a reference substance, usually waterat 4 degrees C; equivalently, the ratio of the mass of a substance to the mass of areference substance for the same volume.
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<element name="SpecificGravityTest" type="diggs:SpecificGravityTestType" abstract="false" substitutionGroup="diggs:AbstractLaboratoryTestProcedure"><annotation><documentation>The procedure of a laboratory specific gravity test. Specific gravity is the ratio of the density of a substance to the density of a reference substance, usually water at 4 degrees C; equivalently, the ratio of the mass of a substance to the mass of a reference substance for the same volume.</documentation></annotation></element>