Why is specific gravity measured for bitumen emulsions during quality control?

Specific gravity is a fast indicator of emulsion composition consistency. It correlates with bitumen content and can reveal dosing errors, dilution, entrained air, or unexpected water uptake. Monitoring specific gravity helps operators detect off-spec batches early and supports mass to volume conversion for logistics and site application planning. Used together with residue tests, it improves confidence that the delivered emulsion matches the ordered grade and expected spray rate behavior.