Question

why water boils at 273k

Answer 1

Water does not boils at 273K. It is $0^{o}$C. Water boils at 373K $i.e.,$ $100^{o}$C.


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Answer 2

It is because in the Celsius scale the temperature are from 0 degree to 100 degree Celsius.In Kelvin scale it ranges from 32 degree to 273 degree Kelvin.Water boils at 100 degree on Celsius scale and so it boils on Kelvin scale at 273 degree.