How do you determine which temperature scale is the most accurate?

Answer 1

There is no such thing as a "most accurate temperature scale". Back when people were still getting a handle on the fact that temperature was something you could measure, some scales were more well-defined than others, but all the temperature scales still in use are defined extremely precisely, so they're all equally "accurate". It doesn't matter whether you call the freezing point of water at standard pressure "32 F" or "0 C" (or, like a sensible person, "273.15 K"), it's still the freezing point of water at standard pressure.

Answer 2

The accuracy of a temperature scale is determined by the consistency and precision of its measurements. The Celsius and Kelvin scales are widely regarded as the most accurate due to their clear definition based on universal physical properties (water freezing and boiling points). Additionally, the Kelvin scale is preferred in scientific settings because it starts at absolute zero, the theoretical coldest temperature.