Indirectly false.
Even though we don't use metric directly in most cases in the US, the US customary units have long been rebased to be defined by metric units.
Inches and pounds are just centimeters and newtons walking around in a whacky outfit.
Even though we don't use metric directly in most cases in the US, the US customary units have long been rebased to be defined by metric units.
Inches and pounds are just centimeters and newtons walking around in a whacky outfit.
I think the point is that the US customary units are typically used in a very different way, with fractions being way more important than in metric. See the image in this [1] article that talks about drill sizes for DIY use, for instance. You guys go like "oh no the 5/16:ths hole is too small, I'll step up to 19/64ths that should do it". Over here in metric-world we go more like "oh no the 7.9 mm drill was too small, I'll step up to 8 mm".
Again, the fact that it's easy to convert the 5/16:ths to 7.9375 mm is not the point, the point is how the decimal/metric units are used in practice.
The US yard is exactly 0.9144m such a short decimal expansion is highly unlikely when selecting two random units of measurements. It is short because we defined the modern yard in terms of meters, selecting a short decimal expansion that was still "close enough" to the old definition to allow tooling to remain the same.
The units of the metric system are defined by physical properties that appear to be constant throughout the universe.
The units of the US customary system are defined as some exact number of equivalent metric units.