Matter is composed of tiny particles. The particles of solids, liquids, and gases are composed of atoms and molecules. The particles of plasmas are composed of negatively charged electrons and positively charged ions.
The particles of solid substances contain very little energy. When enough heat energy is added to a solid substance, it becomes a liquid. With incresed energy, liquid particles are able to move faster than solid particles. As additional heat energy is added to a liquid substance, it becomes a gas. Gas particles have higher energy and can move quicker than liquid particles. If enough heat energy is added, electrons are pulled away from the atoms in a substance. This results in particles that are composed of electrons and positively charged ions. The particles of a plasma substance have the most energy and therefore, move the fastest.