Phase Change Materials (PCM) absorbs a large amount of heat in the process of changing from solid to liquid phase and this results in cooling of the surroundings. 

If you are not versed with the subject, you will have to think hard before you give an example of another Phase Change Material. Well, you will say that your breakfast butter is also a Phase Change Material - PCM. This too happens with a lot of heat absorption or release when it changes phase at about 40-45C.

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