Solid: Rigid Structure, the most dense (few exceptions). Liquid: Not as dense. Conforms to any shape. Gas: Conforms to any shape. Molecules are very far apart from each other. This is the lightest. read more
Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. The following figure illustrates the microscopic differences. read more