But with the metric system you only really get cm (too coarse) and mm (too fine) but you don't get something like 9/16 so you can't "work in 16ths" and have everything be whole units again.
Adjusting HVAC in degrees-C is infuriating to my Fahrenheit sensibilities. 20C is cold, 22C is hot. 21C is probably ok but really I want something like 20.5C. The comfortable range for a room is 3-5 whole units of F, but requires a bunch of fractions in C that you may not even have available on your thermostat.
Sure, converting between units is easy in the metric system. That doesn't make it the best thing to use all the time. Hell, the idea of thousandths of an inch is used commonly, so even the imperial system is base 1000 in some cases. But I've never seen anyone utilize the fractional scale with metric units, probably because the units are the wrong size for that to be useful.
People who use metric units are perfectly happy rounding to the nearest 0.5cm or 0.25cm if that's what's needed, exactly as people do with inches. Why on earth would you imagine people use mm if something doesn't call for them?
Maybe metric users do use fractions and I just don’t hear about it. Is that table one and a quarter meters high?
If you're cutting it yourself, a precision of 1mm is finer than your saw blade or pencil line anyway, so it's plenty enough.
When I hear anything past about 1/8th of an inch my brain shuts down, and I give up.
In reality I use both systems all the time. It’s situational.
> When I hear anything past about 1/8th of an inch my brain shuts down, and I give up.
Realistically, same. 32nds don’t get used outside of some specialty wrenches. 16ths are a practical limit where other scales start to make more sense. Probably millimeters.
> How do you divide 7"3/8 by 5?
Same way I divide 4.7625 cm by 5. With a calculator.
When more precision is needed, so easy to go to the 32nd
That's not realistic, obviously, so we just pick one. The units in the system are arbitrary, really.
In reality regardless of the system you choose every calculation is going to end up with fractions of something. You aren't just going to do it in your head.
For example, you could define mars units where the gravitational acceleration on mars is 1. Now your velocity in freefall is just equal to the time you've been freefalling! You don't even have to do a calculation!
(note: Don't actually do this. Gravitational acceleration isn't a constant when you're doing orbital mechanics.)
