The most accurate and scientific is the kelvin scale and the SI unit of temperature and maybe their were different scales used in different countries but why use all three of them everywhere. Like we can use USA using miles while other countries use kilometer. But they both are not used at a single time at a single place. But why use 3 scales at once?
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Kelvin isn’t “the most accurate.” It’s literally just the Celsius scale shifted by an offset.
Celsius and Fahrenheit exist simply because two different people used two different basis of reference for their temperature systems (the freezing and boiling points of water and brine, respectively). Different countries then adopted whichever one they wanted, pretty much just like metric and imperial.
Kelvin came about because it was desirable to have a measure of temperature based on what temperature actually is: heat, which is the movement of atoms, rather than arbitrary phase change points of some specific material.
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