There’s also no such thing as an inch. It’s defined by the meter, there isn’t an official yardstick.
The only reason the UK, Canada and USA used the same inch is because they needed to interchange parts for weapons and machines during WW1. Despite all thinking they used the same measurement system the definition had drifted between them. Metric was defined by enlightenment people with better methods of reproducing the standard. So it was easier to adopt a inch definition based on 25.4mm.
The UK and US inch only match because of WW1. The imperial volumes are still different.
There’s also no such thing as an inch. It’s defined by the meter, there isn’t an official yardstick.
The only reason the UK, Canada and USA used the same inch is because they needed to interchange parts for weapons and machines during WW1. Despite all thinking they used the same measurement system the definition had drifted between them. Metric was defined by enlightenment people with better methods of reproducing the standard. So it was easier to adopt a inch definition based on 25.4mm.
The UK and US inch only match because of WW1. The imperial volumes are still different.