Thermochromism is the belongings of substances to transform color due to a alteration in temperature. A mood ring is an admirable example of this phenomenon, but thermochromism also has more realistic uses, e.g. in baby bottles (changes to a different color when cool enough to drink) or kettles (changes when water is at or near boiling point). Thermochromism is one of some types of chromism.
Thermochromism
