Here (UK) spirits are either 25ml or 35ml. 25ml is close to the old sixth of a gill which was standard in England and 35ml is close to a quarter of a gill which was standard in Ireland.
But beer is in pints. Proper pints, not the rather camp US pints. From my cold, dead fingers etc.
Milk is sold in ml, but often as 568ml which is a pint. Groceries otherwise in grammes or kg. Not so long ago in Ireland, and doubtless here too, spuds would be sold in stones, but butter in pounds. Different units for different purposes.
Which is heavier, an ounce of feathers or an ounce of gold? An ounce of gold, because that would use troy ounces whereas feathers would use avoirdupois ounces.
Shoe sizes are in barleycorns, one third of an inch, albeit with an offset.
Other European states have evolved units like 'etti' (100g) in Italy and 'tetarto' (250g) in Greece, but I guess were still new to it all.
And how much does an A4 sheet of standard 80gsm paper weigh? 5g because A0 is one square metre and there are 16 A4 sheets in one A0.
Come on guys, you know it makes sense. Sort of.
Cheers