On the Celsius scale, the boiling point of water is defined as 100 degrees Celsius (°C) at sea level.

On the Kelvin scale, the boiling point of water is 373.15 Kelvin (K).

Conversion between the two scales:

* To convert from Celsius to Kelvin, we add 273.15 to the Celsius temperature. So, 100°C + 273.15 = 373.15 K.

* To convert from Kelvin to Celsius, we subtract 273.15 from the Kelvin temperature. So, 373.15 K - 273.15 = 100°C.