WHAT DO YOU MEAN, 1 FLUID OUNCE OF WATER DOESNT WEIGH 1 OUNCE

America are you OK over there???

WHAT DO YOU MEAN, A FLUID OUNCE IS DIFFERENT IN THE US AND UK

AND THEN THE US HAS A THIRD DIFFERENT FLUID OUNCE

Okay apparently the US and UK use the same ounce for weight, and the UK fl oz is 1 oz weight of water, but the US fl oz is slightly different and is apparently based on how wine was measured in the UK pre-1824???

everything I find out about imperial measurements just makes me more perplexed

@daisy If it makes you feel better, I've been dealing with it for my whole life and I still have to double check how many ounces are in each unit because we just use mass and volume seemingly at random.
@coderanger The ability to convert between units in my head is something I definitely take for granted
@daisy Behold this cursed thing

@coderanger To be fair, tsp/tbsp/cup are still used over here, but they’re defined in terms of mL. (1 tsp = 5mL, 1 tbsp = 20mL, 1 cup = 250mL.)

Interestingly, the Australian metric tablespoon is 20mL but the international metric tablespoon is 15mL. So yeah, we are not entirely free of sin over here.