eli5:- why do we use 3 different measurements for temperature??!

Question

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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Answer 1

Fahrenheit is how a person feels.

Celsius is how water feels.

Kelvin is how a molecule feels.