Asked by Katey

How do thermometers work? I have already looked on Google and I cant find anything! Please help me!
Answered by Princess Anna
Well, Thermometers work on the principle that the volume of a liquid increases as it is heated and decreases as it is cooled.
The bulb thermometer contains a fluid, usually mercury, which expands when it is heated.


Answered by Anonymous
Yes, the liquid expands when temperatures increase. Nowadays, though, mercury is not allowed to be used. Other substances which work like mercury are used.

home.howstuffworks dot com/therm1.htm
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