What does 1.015 mean in sg?

In the context of specific gravity (sg), a value of 1.015 indicates that a substance is slightly denser than water. Since water has a specific gravity of 1.000, a specific gravity of 1.015 suggests that the substance is about 1.5% heavier than an equal volume of water. This measurement is often used in various fields, including chemistry and Biology, to characterize liquids and solutions.