The most common example of a physical change is what happens to water. When water freezes, melts, evaporates, or condenses, it only undergoes physical change. It may change its state from liquid to solid (when it freezes), solid to liquid (melts), liquid to gas (when it evaporates), or gas to liquid (when it condenses), but whether it is solid, liquid, or gas, it is still water. It doesn’t become another substance. For that reason, it is only a physical change.