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Difference in temperature cannot be expressed in °C. It’s not 5 °C warmer today than yesterday. It’s 5 K warmer. You can say “five degrees warmer”, but not “five degrees Celsius warmer” or “five Celsius warmer”. “Five Celsius degrees warmer” is also correct, but who’d do that?
The reason is that the Celsius scale has a fixed offset. If your birthday is in a week, you wouldn’t say it’s “one seventh of January from today”.
I was not aware of this before and this is probably one of the most pedantic things I've heard for a while - great answer.
Glad you appreciate it for what it is.
Can you explain more on this? I still don't get it.
As of now, although I am not a man of authority on this subject, I still think temperature difference can be expressed by using celcius simply because the celcius has the same equivalent difference as Kelvin. The difference of the two value of the same unit will still be the same unit.
First, from here
Secondly from here
TIL; January has 49 days.
Thank fuck I'm from the US and don't have to fuck with any unit conversion fuckery.
The same applies to Fahrenheit, differences between temperatures in Fahrenheit should be expressed using the Rankine scale.