If the temperature a substance increases from 20 to 35 Celsius, what is the total temperature change on the Kelvin scale?
The change is an increase of 15 Kelvin.
Calculating changes in Celsius and Kelvin will reveal the same magnitude. If the change is +15 degrees Celsius, the change is +15 Kelvin (note that it's not degrees Kelvin, just simply Kelvin).
You can use the conversion, which is 273.15 Kelvin = zero degrees Celsius. Since it's a relative scale,