How big is medium?

[GoesStation]

To further the confusion, there are also fluid cups vs. dry cups.

I couldn't find a reference stating those are different volumes. There are measuring cups designed for dry ingredients, though; they hold exactly one cup when filled to the brim. You mound the flour in one, then sweep off the excess with a flat spatula.

 

[SoothingDave]

I checked a units of measure site I use. The cups are same wet and dry, but definitions of other units, like "barrel" differ.

 

[Tdol]

Hey, it's weird to think why on earth anyone would want to infringe on liberty by making measures universal. ;-)