1. The problem statement, all variables and given/known data I'm doing calorimetry, and I have 34.73C and 63C. I need to subtract 63 from 34.73, and get the answer in Kelvin. 2. Relevant equations 3. The attempt at a solution I know you add 273 to Celsius values to get Kelvin, but I am not sure which of these methods is correct: 1. (34.73C+273) - (63C+273) = -28.27K 2. 34.73C-63C = -28.27C. Then, -28.27C + 273 = 244.73K Which one is the correct method? The first one seems unlikely just because the Kelvin's are essentially canceled out in the equation..