In fairness the fluid ounces are also different, an Imperial (english) fluid ounce is 28.41306mL, while a US Customary fl oz is 29.5735mL. So the Imperial floz is 96% the american’s, not enough to acount for having 25% more of them in a gallon, but it does lead to the Imperial gallon only being 20% larger than the customary gallon.

But wait there’s more! The US also has the “food labelling” fluid ounce which is not the customary one, instead it’s exactly 30mL.

And yet we claim to live in a science based society.

I mean, there are a million things, that do not need universal standards, but standards are imposed anyway.

But where one standard would be really helpful, like scientific values, we have many. And some people would rather go to prison, than adopt. (I think that happened in the UK, after they force switched to metric)

Keep digging and all the imperial standards are just an arbitrary conversion from metric at this point.

1 ft = exactly 30.48 cm; One pound is exactly 0.45359237 kilograms as in 0.453592370000000000… kilograms.

Not only they might go to prison, they may risk values and lives of others, too:

https://usma.org/unit-mixups

Well in a general sense, yes, but the particular case I remember was a (fish?) seller at a local market, so nothing life endangering.

Yes, diversity must be stamped out for out corporate masters. All of humanity must be uniform and there can be no divergence.

The UK also uses pints for dairy milk, but litres for plant-based milks. UK must be completely disregarded if you're looking to make sense about what units to use.

They're sold in pints but labelled in litres. My supermarket sells .568, 1.13 and 2.26L containers.