There are four phases of matter; these are solid, liquid, gas and plasmas. Solids have a definite shape and volume. Liquids have a definite volume, but not a definite shape. Gases have no definite shape or volume. Plasmas are highly ionized gases that occur at high temperatures.
Phases of matter can be changed by pressure and temperature. These changes can occur in the element's density, viscosity and malleability. Eleven elements on the periodic table are gases, two are liquids and the rest are solids.Learn more about Earth Science