International reference triple point

  1. 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
  2. jcsd
  3. mfb

    Staff: Mentor

    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.
  4. 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
  5. mfb

    Staff: Mentor

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

    Search engines should find some.
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