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Cup is a standard size for measuring liquids: 8 fl oz. It's only a problem for flour, because how much you can fit in a cup varies depending on humidity and how much you pack it.

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To add to this, there are at least 3 "cup" sizes for liquid: metric (~250ml), the US version (above, ~236ml) and an imperial cup (~284ml).

A metric cup is exactly 250ml though, not approximately, right?

Also the Japanese cup [1], which is 200 mL. I (American) have come across it twice (a rice cooker, and a dandan recipe).

[1] https://en.wikipedia.org/wiki/Cup_%28unit%29#Japanese_cup

Except one cup in metric is 250 ml, not the ~236ml that a US cup is.

Thanks! Didn't know that.

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