Examples of reversible changes include melting chocolate and changing it back into a solid by cooling it, and melting candle wax by heating it and solidifying the wax by cooling it. Reversible changes are changes that can be reversed. They are also known as physical changes.
Other examples of reversible changes are freezing orange juice by cooling it and melting it by heating, as well as dissolving salt into water and removing the salt by boiling the water. A reversible change changes how a substance looks or feels, but it does not create a new substance even though the size, shape and color of the matter may change. Reversible changes may occur when substances are mixed but do not react.