This term refers to how much matter is present within a given quantity or sample of metal. It's typically measured in grams (g) or kilograms (kg).
The mass (in grams) of one mole of a substance, based on the atomic masses of all its atoms.
A measure of mass per unit volume; essentially how tightly packed the 'stuff' in an object is.
Atomic Weight: The average mass of atoms in an element, calculated using the relative abundance of isotopes in a naturally-occurring element.