International reference triple point

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Discussion Overview

The discussion revolves around the use of the triple point of water as a reference point for temperature measurement. Participants explore how this reference can be utilized in the calibration of thermometers and the establishment of a temperature scale, particularly in relation to absolute zero.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant notes that the triple point of water is at 273.16K and atmospheric pressure, questioning how it can serve as a reference for measuring temperature.
  • Another participant suggests that a linear thermometer can be calibrated using measurements at approximately 0K and at the triple point, adjusting the scale accordingly.
  • There is a reiteration of the importance of the triple point of water and absolute zero as fixed reference points for the Kelvin scale.
  • Some participants express a desire for additional resources or links to understand the construction of thermometers better.

Areas of Agreement / Disagreement

Participants generally agree on the significance of the triple point of water and absolute zero as reference points for temperature measurement, but there is some uncertainty regarding the specifics of thermometer calibration and construction methods.

Contextual Notes

There are limitations regarding the assumptions made about the linearity of thermometers and the exact methods for achieving temperatures close to absolute zero, which are not fully explored in the discussion.

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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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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.
 
mfb said:
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
 
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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