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What liquid is used in non-mercury thermometers?

What liquid is used in non-mercury thermometers? - Physics Forum

What liquid is used in non-mercury thermometers? - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #1  
Old 07-11-2004, 08:26 AM
J.J.
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Default What liquid is used in non-mercury thermometers?



What liquid is used in glass thermometers that do not contain
mercury?

I think it used to be some sort of alcohol?

Does anyone know exactly what is in the liquid?
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  #2  
Old 07-11-2004, 01:15 PM
Sam Wormley
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Default What liquid is used in non-mercury thermometers?

"J.J." wrote:

See: [Only registered users see links. ]
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  #3  
Old 07-11-2004, 08:20 PM
Prai Jei
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Default What liquid is used in non-mercury thermometers?

J.J. (or somebody else of the same name) wrote thusly in message
<9523600087BB6471AE@130.133.1.4>:


It's usually alcohol that's coloured with a dye so you can easily see it.

Alcohol thermometers can cover *lower* temperature ranges than mercury.
Mercury freezes close to the point (-40) where the Fahrenheit and Celsius
scales cross so cannot be used for lower temperatures but alcohol remains
liquid well below this range. On the other hand, for higher temperatures
(greater than 50C or so) mercury has to be used.

For typical room temperature thermometers either liquid could be used,
though perhaps alcohol is favoured since it is less toxic in the event of a
breakage. For scientific use the liquid appropriate to the temperature
range in use, must be used.
--
Paul Townsend
I put it down there, and when I went back to it, there it was GONE!

Interchange the alphabetic elements to reply
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  #4  
Old 07-13-2004, 05:57 PM
Helmut Wabnig
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Default What liquid is used in non-mercury thermometers?

On Sun, 11 Jul 2004 09:26:14 +0100, "J.J." <[Only registered users see links. ]> wrote:


Gallium with some "secret" addons
(actually you need a mixture of 3 metals)

w.
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  #5  
Old 07-13-2004, 06:18 PM
Andreas Erlbacher
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Default What liquid is used in non-mercury thermometers?

Helmut Wabnig wrote:
I think it is toluene with some dye.

AE

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