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Kelvin is better because it is the SI unit of temperature 
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but celcius is also CGS unit of temperature
But international system of units is given first preference
ok thank you
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Scientifically, kelvin is given more importance, since:
1. it does not possess negative values.
2. any molecular motion ceases to zero at 0 K. Therefore, 0 K (or 0.1 K) is the lowest temperature possible.
but in geography celsius is more prevalent