Question

the boiling point of water is 100°c express this is st unit

Answer 1

Hello 
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Kelvin is the SI unit of temperature 
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1° C = 273 K 
if you wanna convert °C into Kelvin just add 273.15 in it 
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So 100°C = 373.15 K
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Answer 2

The boiling point of water is 373k ie the si unit of temp.