This video closely examines the four states of matter: solid, liquid, gas, and plasma. Water, as well as other materials, are used as examples as to why a single substance can exist in so many different forms. Through interesting visual examples of the many uses of water, students learn about viscosity, elasticity, solids, liquids, gases, phase changes, Boyle's Law, Charles' Law, vaporiztion, sublimation, melting, freezing, and condensation, as well as many other concepts.