SYMMETRY OF MATTER
Matter is kind of weird. The states of matter are not always rigid. Some substances can act like a liquid and some like a gas. For example a bubble is a liquid that traps air and acts like a gas. Shaving cream or whipped cream are both solid and gas (colloidal suspension).
The characteristics of substances which enable us to distinguish it from other substances are known as properties. Physical properties can include: solubility, melting point, boiling point, density, volume, weight, and shape. Silicon for example can have the following properties: