On the list of stupid things the US does, this is up there with using MM/DD/YY. Along with MPG. I’m sure that many people don’t agree with it, but they put up with it, because it’s a way of life. There’s been attempts to change it, but it hasn’t worked, usually for political reasons.
“The measuring system that the United States uses right now isn’t really a system at all. It’s a hodgepodge of various units that often seem to have no logical relationship to one another, units collected throughout our history here and there, bit by bit. Twelve inches in a foot, three feet in a yard, 1,760 yards in a mile.
The metric system, by contrast, was intentionally created with ease and simplicity in mind. And as a result, it’s incredibly efficient to use. All you need to do is multiply or divide by some factor of ten. 10 millimeters in a centimeter, 100 centimeters in a meter, 1,000 meters in a kilometer. Water freezes at 0°C and boils at 100°C.”