Difference between the absolute thermodynamic temperature scale and ITS-90

AI Thread Summary
The absolute thermodynamic temperature scale is an ideal scale based on thermodynamic laws, requiring theoretical devices like ideal gases for measurements. In contrast, the International Temperature Scale of 1990 (ITS-90) is a practical scale defined by real-world laboratory devices. ITS-90 serves as a calibration standard for the thermodynamic scale but is not a scale in itself. The key distinction lies in the practical applicability of ITS-90 versus the theoretical nature of the absolute scale. Understanding this difference is essential for accurate temperature measurement and calibration in scientific contexts.
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Homework Statement


What is the difference between the absolute thermodynamic temperature scale and the practical temperature scale: ITS-90?

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The Attempt at a Solution

 
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Do you want to know the conceptual difference between the two scales, or do you want to calculate the (numerical) difference between them?
 
I wanted to know the conceptual difference between the two scales. Is there anything else except that ITS-90 is a calibration standard for the thermodynamic temperature scale, not a scale itself? Could you please tell in your own words, without any links to bunch of information. Would really appreciate it!
 
ITS-90 is a "practical" temperature scale, defined in terms of real devices that you can use in a laboratory. Thermodynamic temperature is an "ideal" scale, defined using the laws of thermodynamics. In order to make measurements using it, you would need to use devices that don't exist in practice, e.g. ideal gases or Carnot engines.
 

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