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Refractometry

Absolute Specific Gravity:
The ratio of the weight of a given volume of a substance in a vacuum at a given temperature to the weight of an equal volume of water in a vacuum at a given temperature.

Specific Gravity:
The ratio of the mass of a body to the mass of an equal volume of water at 4°C or other specified temperature. Dimensions, unity.

Density:
Concentration of matter, measured by the mass per unit volume. Dimensions, (ml-3).

 

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