Does mass or volume affect the density of the substance?

Answer 1

Yes, both do. Density = Mass/Volume,

So density is directly proportional to mass and inversely proportional to volume.

Answer 2

Density is determined by the mass of a substance divided by its volume. Therefore, both mass and volume do affect the density of a substance. If the mass increases without a corresponding increase in volume, the density will increase. Conversely, if the volume increases without a corresponding increase in mass, the density will decrease.