How can I make accurate temperature meausurments

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Offline syhprum

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How can I make accurate temperature meausurments
« on: 11/12/2010 13:01:26 »
It is easy enough to make a simple Mercury in glass thermometer and calibrate it with boiling and melting water but there are many sources of error.
If I wanted confirm that a temperature was 30.01C and not 30.02C how could I do it ?.
syhprum

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Offline Bored chemist

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How can I make accurate temperature meausurments
« Reply #1 on: 11/12/2010 13:55:04 »
With some difficulty and, probably, a platinum resistance thermometer.
http://en.wikipedia.org/wiki/Resistance_thermometer
Fortunately for you the temperature you are looking at is very close to the triple point of gallium which is accurately known (29.7666C or 302.9166 K) so you could probably extrapolate to 30.01 or 30.02 degrees.
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Offline syhprum

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How can I make accurate temperature meausurments
« Reply #2 on: 14/12/2010 22:03:36 »
I am grateful for your hint that I can use Gallium to calibrate my thermometer but how has its triple point been determined to one part in ten thousand ?
syhprum