Question

​​​​​ If 0°celcius equals to 273 Kelvin and 100° celcius is equal to 373 Kelvin so is 1° celcius equals to 274 Kelvin ? If not, Why and How?

Answer 1

Yes it is.
To be precise, to convert from Celsius to Kelvin add 273.15
Therefore,1 Celsius is 274.15 Kelvin exactly.