Changes in state from one form of water to another is the key to the water cycle. Understanding what happens to make water go from a solid to a liquid to a gas is REALLY IMPORTANT! Remember the bouncy balls in the jar! Changes like melting and evaporation REQUIRE energy so that the particles will speed up and are called ENDOTHERMIC. Changes like freezing (we are calling it solidification) and condensation GIVE OFF energy so that the particles will slow down and are called EXOTHERMIC.
Explore changes of state with this simulation