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What substance can be calculated by dividing its mass by its volume?
It's not exactly a "substance" but Density = Mass / Volume
Why is density a characteristic of a substance and volume and mass are not?
The volume and mass of a substance are independent of the substance itself, but depend upon how much there is of the substance The density of a substance is the relation between how much volume you have of a substance and how much mass that volume has (and vice-versa). It is independent of how much there is of the substance and is thus a characteristic of the substance.
What would be the units of measurement for volume and mass?
In the metric system, the units of measurement of Volume is the Liter (sometimes spelled Litre) and the measurement for mass would be the gram. In the American system, the units of measurement for Volume is the ounce, and for mass would be the pound.
Is the density of a substance obtained by dividing its volume with its weight?
The density is measured by dividing the mass of the substance with it's volume. Density = Mass/Volume.
What is the formula of the percentage by mass and volume?
Percentage by Mass = Mass of substance of interest/Total Mass Percentage by Volume = Volume of substance of interest/Total Volume Converting from one to the other requires information about their relative densities.
