Final answer:
Knowing the weight and specific gravity of a substance allows you to determine its volume. By calculating the density using the specific gravity and weight, you can rearrange the formula to find the volume.
Step-by-step explanation:
When you know the weight and specific gravity of a substance, you can determine the volume of the substance.
Specific gravity is the ratio of the density of a substance to the density of a given reference material. By knowing the specific gravity and weight of a substance, you can calculate its density. Density is mass divided by volume, so if you know the density and weight, you can rearrange the formula to find the volume.
For example, if you have a substance with a weight of 1.05 kg and a specific gravity of 2.7, you can calculate its volume by dividing the weight by the density (which is the product of specific gravity and the density of the reference material).