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How do chemical heat/cold detectors work?
How do chemical detectors that react upon being exposed to temperatures above or below a pre-set threshold work? Often found on the outside of temperature-sensitive shipping containers, the reaction causes a change in the color of the material. Some setups have the color change being permanent, in order to check for temperature continuity during the course of shipping. Are their liquids that react in similar fashion? In a separate note, what are some reactions that can be used for various given temperatures?
1 Answer
- Bob BLv 78 years agoFavorite Answer
This might reveal a bit more information:
http://en.wikipedia.org/wiki/Thermochromism
Basically, certain compounds will, above a certain temperature, change their chemical state slightly, causing a colour change. Some are reversible, others irreversible, depending on what you want to measure.
