Comment by itronitron
3 years ago
F to C -> subtract 32 and divide by 1.8
C to F -> multiply by 1.8 and add 32
This sounds messy but works out well for a lot of temperatures we are used to, for example... 0C is 32F ... 100C is 212F ... 20C is 68F ... 30C is 86F ... etc.
Why on earth would anybody willingly do that, unless forced by situation... and that situation should not be happening in 2023, period. Heck, even whole science is on metric system and Celzius/Kelvin scale so there goes usability argument.
I've heard all the excuses in past 4 decades whenever this topic comes up, but they can all be summed up as: butthurt ego, we are better than anybody and we don't care about reasons.
In Europe, during more primitive medieval times, even my tiny little country that wasn't country before had maybe 10 different measure systems mostly based on human body, various weight systems etc. There were always reasons for system XYZ, different conversion tables and so on. They were not worse than what US uses now, and are all part of history for same very good reasons.
Its not even a topic about 2 balanced viewpoints like driving left or right, metrics et al have trivial conversions so even folks struggling to finish primary school are well versed in it. What you describe is impossible to do for even older university-educated folks, unless they have been doing it for their whole lives.
I always forget when do subtract or add, or divide or multiply. So I use the known conversions 0->32, 100->212 to help remember.