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International reference triple point

by Outrageous
Tags: international, point, reference, triple
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Outrageous
#1
Nov22-12, 05:20 PM
P: 375
I know the triple point of water is at 273.16K and atmospheric pressure
But how are we going to make it as a reference when we measure temperature of something?

Thank you
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mfb
#2
Nov23-12, 09:05 AM
Mentor
P: 11,576
Simplified: Get a thermometer which is linear in temperature, check its measurement at (approximately) 0K and at the triple point, adjust the scale to get the correct values there.

It helps to measure other triple points, so they can be used as additional reference.

I know the triple point of water is at 273.16K and atmospheric pressure
611Pa, or 0.006 times the atmospheric pressure.
Outrageous
#3
Nov23-12, 06:06 PM
P: 375
Quote Quote by mfb View Post
Simplified: Get a thermometer which is linear in temperature, check its measurement at (approximately) 0K and at the triple point, adjust the scale to get the correct values there.

It helps to measure other triple points, so they can be used as additional reference.

611Pa, or 0.006 times the atmospheric pressure.
So do you mean that between 0K and triple point is used to do temperature scale?
approximately to 0K mean we cool it as low as possible?
Do you have any link or reading source that explain to make thermometer?
Thank you

mfb
#4
Nov24-12, 08:27 AM
Mentor
P: 11,576
International reference triple point

0K and the triple point of water are the fixed reference points for the temperature scale. They are used to fix the kelvin scale.

Do you have any link or reading source that explain to make thermometer?
Search engines should find some.


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