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Celsius vs Kelvin with heat capacities

Posted: Wed Jan 17, 2018 10:15 am
by Michelle Chernyak 1J
In the book, it seems as though they sometimes use Celsius and kelvin interchangeably without applying a conversion when referring to heat capacities. Why is that?

Re: Celsius vs Kelvin with heat capacities

Posted: Wed Jan 17, 2018 10:17 am
by Deap Bhandal L1 S1J
Usually in the equation, they are using delta T and since both Celsius and Kelvin have the same unit interval, final temp minus initial temp would be the same.

Re: Celsius vs Kelvin with heat capacities

Posted: Wed Jan 17, 2018 10:19 am
by Justin Chu 1G
I think it's because the entire equation (deltaH or q) uses the CHANGE in temperature and not the VALUE of the temperature so the change in degrees Celsius vs the change in degrees Kelvin would be the exact same change as Kelvin is simply Celsius + 273.

Re: Celsius vs Kelvin with heat capacities  [ENDORSED]

Posted: Wed Jan 17, 2018 10:26 am
by Chem_Mod
I mentioned this several times in class, and also discussed heat capacity units in detail giving several examples: kJ.C-1; kJ.K-1

As discussed there is no conversion needed as a difference of one degree Celsius is the same as a difference of one Kelvin.

20 ---> 30 degrees C
delta T = 10 C

293.15 ---> 303.15 K
delta T = 10 K

Make sure to discuss this in a peer learning session or office hour.