MEASUREMENT

1.9 - Specific Gravity

Specific gravity of a substance a comparison of the density of a substance relative to a standard value. Scientists express specific gravity of liquids and solids using water at 4^oC as the standard.

In calculating the specific gravity of a substance, the density of the substance and the density of water are expressed in the same units. This leaves specific gravity unitless.

The density of water at 4^oC is 1.00 g/mL. Therefore, the density of solids or liquids expressed as g/mL is numerically equal to their specific gravities.

The notation of expressing specific gravity is given below. Place your mouse over the image to get a brief explanation of the notation.

Section 2.9
Specific Gravity ..p39

Back		Reading List Unit #1 Practice Problems