For people who don't get any of this, Americans use:
* Inches and fractions for "small" things: 7½ inches, 15¾
* Feet and inches for "large" things (like more than 2 feet): 6 feet 2 inches, 30 feet 7¼.
* Thousandths of an inch for tiny things: 38 thousandths, off by a 'thou.
* 1 foot 3 3/8 inches is valid but uncommon, people typically just say 15 and 3/8ths
* 5.91 inches is weird, converting from millimeters (not hundredths of a mm) you probably best round to 5 and 15/16ths which at least is on a tape measure
* 0.79 feet is just malarkey
In England we measure speed with furlongs per fortnight.
It's a rather bizarre mix of units here - the transportation systems interchangeably uses kilometers and miles, some shop owners by principle refuse to use kilograms and insist on "pounds" (without realising a "pound" is defined in law using grams and that there was like a dozen of "pounds"), fuel efficiency is measures in miles per gallon, but it's a different gallon from the one used in the US. In general, the whole units situation is nothing but a confusing dick contest.,,
For that reason, the imperial units can probably still function in daily usage in isolated environments - for example among car mechanics or plumbers. There you don't *design* a ½" pipe, you just go and buy it, so the dimension really functions as a label and you could just as easily got and acquire the right pipe using a hypothetical "P12" symbol or whatever else.
@kravietz
America being an isolated environment has helped it avoid invasion for a long time because oceans. I’ve never heard of it referred to as an isolated environment though. Most people are upset we just won’t shut the f up. Imperial units is functioning for daily usage over here just fine.
Piping, which someone did design as 1/2”, is the worst of examples. Is the diameter the ID or OD”? What’s it made for? How thick is the wall? How much pressure can it take? What’s it made out of? How does it connect? The “P12” symbol serves a good purpose.
I think I got lost in that example.
@cjd