Is 0 a number? If it is, this thing calls apart really quickly.
is 0 a number? one of my favorite :
If it is 0 degrees and it gets twice as cold, how cold is it?
PS I do not know the answer and C or F use either.
No. It is a numeral. Just like black is not a color. It is the absence of all color. Zero is the absence of all numbers.