How can you know density if the mass is unknown?

Answer 1

To find density if you have a known mass, you must have the volume that the mass occupies. Density is weight (mass) per unit of volume, so a volume for a given mass must be known to make a density statement. You must know the mass and volume to calculate density.

Answer 2

To get density, one usually always measures mass first since there are so many tools available to do so. I suppose,though, that through a system of trial and error one could get an approximate density of a substance by seeing if the substance in question floats or sinks in solutions of known density.

Answer 3

Density can be calculated by dividing the unknown mass by the volume if the volume is known. If neither the mass nor the volume is known, the density cannot be determined.

Answer 4

For liquids you can use different types of densimeters.