Americans definitely love their larger 1/4 lb’ers over the smaller European 1/3 lb patties
(lemmy.world)
That's a ridiculous mischaracterization. The word "Ounce" derives from a word meaning "one twelfth", so just like the inch to the foot, an ounce is either one sixteenth of a queen Anne pound of wine (which is itself based on the Queen Anne gallon of wine, or 231 cubic inches of wine), or one twentieth of an imperial pint, which is an eighth of an imperial gallon, which is ten water pounds.
Flasks are a unit of mercury weight, obviously.