Sometimes, other systems just make more sense.
For example, for time, or angles, or bytes. There are properties of certain numbers (or bases) that make everything descending from them easier to deal with.
for angles and time (and feet): https://en.wikipedia.org/wiki/Superior_highly_composite_numb...
For other problems we use base 2, 3, 8, 16, or 10.
Must we treat metric as a hammer, and every possible problem as a nail?
The ancient Sumerians used multiples of 60, as we continue to do for time and angles (which are related) today. It makes perfect sense. 60 is divisible by 2, 3, 4, 5, and 6, which makes it easy to use in calculations. Even the metric people are not so crazy as to propose replacing these with powers of 10.
Same with pounds, for example. A pound is 16 ounces, which can be divided 4 times without involving any fractions. Try that with metric.
Then there's temperature. Fahrenheit just works more naturally over the human-scale temperature range without involving fractions. Celsius kind of sucks by comparison.
Not sure if you're actually serious... 1 kg is 1000 g, dividing with 4 gets you 250 g, no fractions. And no need to remember arbitrary names or numbers for conversions.
> Then there's temperature. Fahrenheit just works more naturally over the human-scale temperature range without involving fractions. Celsius kind of sucks by comparison.
Again, I'm not sure I get it. With celsius, 0°C is freezing temperature of water and 100°C is boiling point of water. For fahrenheit it was something like 32 and 212? And in every day use, people don't need fractions, only full degrees. Celsius also aligns well with Kelvins without fractions (unlike fahrenheit).
But Fahrenheit aligns well with Rankine without fractions (unlike Celsius). [Imagine some symbol here indicating humour.]
IOW each Celsius degree is bigger than each Fahrenheit degree.
Even though the F numbers are so much higher and it seems unbearably hot :)
So for a thermostat that only can be set in 1 degree increments (without a decimal point), you have finer control when using F than using C.
Anybody can memorize the conversion more easily by throwing out the math, using table lookup -- made easier by throwing out most of the table too.
Just remember every 5 C equals a non-fractional F.
And every 5 C equals 9 F.
If all you are interested in is comfort level it's like this:
C F
0 32
5 41
10 50
15 59
20 68
25 77
30 86
35 95
40 104
Looks like it increases by 1 each time in the tens column, but it's only 9 so 50 & 59 are the outliers, which most people have memorized already.
If you are a Celsius native and you think in terms of 10, 15, 20, 25, 30 -- you only need to remember 5 different F numbers, 50, 59, 68, 77 & 86 and that will get you far.
Good luck using these as your lottery numbers ;)
So, I appreciate your rendition of things I have tables for already but any actual need is sadly non existant.