this post was submitted on 22 Aug 2023
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Celsius is literally Kelvin + 273.15. They measure the same thing.
Fahrenheit is as Celsius is to rankine, which is also a measure of absolute temperature.
I'm not quite clear on where this is confusing you, Celsius is improper in many non relative equations yes but that's due to the math not a fundamental difference in what is being measured.
Ah, I guess I misread (in my own research) or somehow missed that a degree change in Celsius was directly pegged the same degree change in Kelvin (shifted by 273.15 ) when the Kelvin scale was updated to be pegged to the Boltzmann constant. Thank you for helping me understand where my understanding was flawed!
I guess I still don’t understand the utility of Celsius, though. If it’s really just an alias, shifted by 273.15, for Kelvin, what utility does Celsius offer? Why not just use Kelvin?
Tradition, culture, etc make Celsius a useful tool. Human perception if temperatures is also not well correlated to Kelvin, where a change in 1 K is less than 0.5%, but to a person it certainly feels more substantial. By relating the scale we use daily to freezing and boiling of water, you at least capture both an okay human sensitivity, and important temperatures to us as humans.
Fahrenheit arguably goes a step further, defining a much narrower range for humans specifically, with some landmarks for water.
No system is objectively better, it's all convention and arbitrary. We could define an absolute temperature scale which puts human temperatures at 1 blorp, 0 as absolute 0. Clearly the resolution is pretty low, you'd have to define the weather with decimals. Oh well, that's fine. Annoying maybe, but valid.