International reference triple point

[Outrageous]

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

 

[mfb]

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]

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]

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.

 

[PJC01]

for your question. The international reference triple point is a critical reference point for measuring temperature because it is a well-defined and reproducible state of matter. This means that at the triple point, water exists in a state where all three phases (solid, liquid, and gas) coexist in equilibrium, and the temperature and pressure are fixed. This allows for accurate and standardized measurements of temperature, as the triple point of water is a known and constant value. Additionally, the triple point of water is used as a reference point because it is easily reproducible and can be replicated in different laboratories, ensuring consistency in temperature measurements across different locations and experiments. Other substances, such as other gases and pure substances, also have their own triple points that can serve as reference points for temperature measurements in specific conditions. Overall, the international reference triple point is an important tool for precise and reliable temperature measurement in scientific research and industrial applications.