What is the proper formula for calculating specific gravity?

Specific Gravity Formula Questions:

1) The density of gold is ρgold = 19300 kg/m3. What is the specific gravity of gold?

Answer: The specific gravity can be found by dividing the density of gold by the density of water at 4.0°C:

SG = 19.3

The specific gravity of gold is 19.3.

2) A The specific gravity of ice is 0.92. What is the density of ice, and is it greater or less than the density of water at 4.0°C (liquid water)?

Answer: The density of ice can be found by rearranging the specific gravity equation:

ρsubstance = 0.921000 kg/m3

ρsubstance = 920 kg/m3

The density of ice is 920 kg/m3, which is less than the density of liquid water. This is a very rare property of water compared to other materials. The density of the solid form of a substance is almost always greater than the density of the liquid form. Besides water, the most "common" substance that has this property is plutonium.