They measure the same thing. But they scale it differently, so they must meet somewhere. One, for some crazy reason, has decided the freezing and boiling point of water aught to be exactly 100 units apart. Where the other, sensibly, uses a really cold day in Danzig Germany because the AIR feels cold at that temperature, and what the natural resting point of the human body temperature is, separated by 96 units so as to make the scale easier to make in a lab.
-40°C = -40°F
They intersect at that point for mysterious nature reasons
Linear scale reasons.
They measure the same thing. But they scale it differently, so they must meet somewhere. One, for some crazy reason, has decided the freezing and boiling point of water aught to be exactly 100 units apart. Where the other, sensibly, uses a really cold day in Danzig Germany because the AIR feels cold at that temperature, and what the natural resting point of the human body temperature is, separated by 96 units so as to make the scale easier to make in a lab.