Substance

Substance is the material, or matter, of which something is made. Substances are physical things that can be seen, touched, or measured. They are made up of one or more elemental parts. Iron and aluminium, which are pure, water and air, which are mixtures; are all examples of substances.

Steam and liquid water are two different forms of the same chemical substance, water.

From Wikipedia, the free encyclopedia · View on Wikipedia

Developed by Tubidy