Answer:
Specific gravity is defined by ASTM D4439 (from volume 04.13 on Geosynthetics) as the
ratio of the density
of the substance in question to the density of a reference substance at a specified condition of temperature and pressure.
Step-by-step explanation:
Specific gravity, also called relative density, ratio of the density of a substance to that of a standard substance.
The usual standard of comparison for solids and liquids is water at 4 °C (39.2 °F), which has a density of 1.0 kg per litre (62.4 pounds per cubic foot).
