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Author Topic: What's this RED liquid in my old Thermometer ?  (Read 13047 times)

Offline neilep

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What's this RED liquid in my old Thermometer ?
« on: 19/10/2007 23:30:03 »
Dear Sirs,

Phew !!...hot isn't it ?

Lets take a 'looksee' at the thermometer !



Oh my !!..DOH !!....minus 37 !!..DOH !!..I forgot I'm a hibernating polar bear !!

But what is the RED liquid in my thermometer ?...you get mercury ones yes ?...we all luff those !!...

so, what is it ?...is it just as accurate as mercury ?..is it dangerous ?





 

Offline Simulated

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What's this RED liquid in my old Thermometer ?
« Reply #1 on: 19/10/2007 23:32:24 »
Whouldn't it have to be mercury? Cuz they stoped putting them in newer ones cuz its dangerous..Well that's what both the science teacehrs said..
 

Offline eric l

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What's this RED liquid in my old Thermometer ?
« Reply #2 on: 20/10/2007 09:58:53 »
The red liquid is alcohol (ethanol) with a colorant.  You'll also find alcohol with a blue colorant.
I thought that mercury was more or less outlawed for thermometers now.  I know that they are no longer used in a lab environment because of the toxicity of mercury vapour (in case of a thermometer breaking - which happens only too often).
Alcohol works better for sub zero temperatures (centigrade); for temperatures above 90C we used pressurised thermometers (or rather with higher resistance to pressure) or thermometers filled with an other liquid.
 

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What's this RED liquid in my old Thermometer ?
« Reply #2 on: 20/10/2007 09:58:53 »

 

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