There is a linear relationship. Milestones are simplistically related to water - freezing (0C° = 32F°) and boiling (100C° = 212F°). Both C° and F° are calibrated according to this 0/32 an 100/212 scale.
Other users have shown more detail on the relationship but didn't explicitly mention water / freeze / boil.
CACervantes t1_je8yvza wrote
Reply to Eli5:How does conversion from celsius to Fahrenheit work and is there a "linear correlation" by Moewillgo
There is a linear relationship. Milestones are simplistically related to water - freezing (0C° = 32F°) and boiling (100C° = 212F°). Both C° and F° are calibrated according to this 0/32 an 100/212 scale.
Other users have shown more detail on the relationship but didn't explicitly mention water / freeze / boil.