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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We don’t “use all three of them everywhere”. Most countries use Celsius. A few countries use Fahrenheit. Scientists use Kelvin.
Celsius and Fahrenheit are more useful than Kelvin because the ranges are more applicable for everyday use (such as weather and cooking). Kelvin on the other hand is more useful for certain sciences, so they use Kelvin there.
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