100 Farenheit, a very hot day, is 35 on this scale, but 37C on the real scale. 32F, the freezing point, is 1 on this scale but 0C for real. -10F, freaking cold, is -20 on this scale and -23C for real. For human temperatures the diff is negligible versus the real conversion. Obviously that freezing point is a big problem for real science, but who does real science with Fahrenheit anyhow, even in the US?
Still an ugly conversion, certainly, but you don't need the "2" in the 32 or the 9/5s ratio to get a good-enough-for-the-weather result.
(Likewise in reverse; multiply by two, add 30. Order matters, of course.)
Subtract 30, divide by two.
100 Farenheit, a very hot day, is 35 on this scale, but 37C on the real scale. 32F, the freezing point, is 1 on this scale but 0C for real. -10F, freaking cold, is -20 on this scale and -23C for real. For human temperatures the diff is negligible versus the real conversion. Obviously that freezing point is a big problem for real science, but who does real science with Fahrenheit anyhow, even in the US?
Still an ugly conversion, certainly, but you don't need the "2" in the 32 or the 9/5s ratio to get a good-enough-for-the-weather result.
(Likewise in reverse; multiply by two, add 30. Order matters, of course.)