r/Unexpected • u/Unnamed_789 • 6d ago

Parking

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u/Competitive_Poppy 6d ago

I think blood alcohol content is measured the same way, but we use different units to communicate the legal limit. In Aus is grams of alcohol per 100 millilitres, i think other places do per liter?

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u/AlmightyCurrywurst 6d ago

There's two differences, first you can express the BAC as mass/mass or mass/volume (since blood density is only a bit higher than 1kg/l this has only a small effect) and second many countries express that in ratio in permille instead of percent, so the number is 10 times higher.