What is the relationship between mass and volume of a substance

The formula for density is m/v, d=m/v, usually when a object is larger the mass is more evenly displaced :)

The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic