Comment by Shaanie
3 years ago
On the contrary Fahrenheit and Celsius is one of the harder units to convert. Can't just "halve and remove 10%" in your head like you can for pounds. Though I agree with you that you can't expect Americans to use SI units.
The scale factor is 9/5, which is close enough to 2 that the precision is fine for casual conversion (weather report, discussion of boiling tea on the web, …)
Definitely not. Say, 86F to C. 86F is 30C, but dividing the F by 2 would give you "43C", which converts to 109F. That is not a trivial difference.
You forgot to subtract 32 first. Then you get 27. Or in this case, 54 happens to be evenly divisible by 9, so doing the exact conversion is relatively convenient (divide by nine, multiply by five).
Most folks reading this will have the internet. It makes conversion easy. If you don't, charts help get most common things converted.
Easy.