18 is such an arbitrary place for “special precautions”
cool little trick, you see how -18 is like, pretty close to -20, yeah. You can just round them. It really doesn’t matter
see, that’s what i’m saying. having a scale that starts at “it really doesn’t matter” makes it hard to use for everyday things.
but it literally has numbers?
You know that celsius starts at -273.15 degrees right? That’s ENTIRELY arbitrary, and by your logic, makes the system useless.
you’re literally just making this up?
no, Celsius starts at +273.15 K, because that’s where an element we are all dependent on to live and in contact with every day undergoes an important phase transition.
What happens at 0°F?