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Kelvin is just the degrees Celsius plus 273.15. However, one degree change in Kelvin is equal to one degree change in Celsius. For this reason, I think we can interchange them since we are mainly focused on the change in temperature rather than what the temperature actually is. Hope this helps!
It is a little confusing because we know Kelvin and Celsius to be different, but just remember that a majority of the calculations of temperature we do in this section are just asking for the CHANGE OF TEMPERATURE. Temp change the same way in Celsius and in Kelvin, by degrees. So it doesn't really hurt anything to say that, for discussion's sake, kelvin and celsius are synonymous.
When calculating change in temperature, you can use either Celsius or Kelvin because Celsius = Kelvin + 273. Therefore, when you subtract two Celsius temperatures, they the +273 will cancel out and will equal the different between those two temperatures as Kelvin.
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