The one that’s in my cabinet?
The one that Wikipedia lists as “this is definitely the cup, there’s no doubt about that”?
The cup that’s also called a “coffee cup” as opposed to the cup from which I drink my coffee, which is very different despite also being both a cup and a coffee cup?
The volume that my coffee maker defines to be a cup (or maybe that’s supposed to be a cup, sorry, coffee cup, but not the same coffee cup that the standard coffee cup - which still is named a cup)?
Not for all recipes, not everything can be scaled linearly. Great example is boiling rice - if you scale the amount of water linearly, it won’t work correctly.
A standardized cup is around 240ml. Once you know that you should be able to tell if a cup roughly fits that requirement. Or you just get one designed for baking. Just as widely available as kitchen scales. Or you keep weighing your food. I don’t know what else to tell you.
Which of the cups?
The one that’s in my cabinet? The one that Wikipedia lists as “this is definitely the cup, there’s no doubt about that”? The cup that’s also called a “coffee cup” as opposed to the cup from which I drink my coffee, which is very different despite also being both a cup and a coffee cup? The volume that my coffee maker defines to be a cup (or maybe that’s supposed to be a cup, sorry, coffee cup, but not the same coffee cup that the standard coffee cup - which still is named a cup)?
It doesn’t matter as long as you use the same cup for the entire recipe. That’s part of why I like it better.
Not for all recipes, not everything can be scaled linearly. Great example is boiling rice - if you scale the amount of water linearly, it won’t work correctly.
And as long as you keep track of which of your 5 different cups is the one that’s 16 times larger than the tablespoon measuring scoop. :)
A standardized cup is around 240ml. Once you know that you should be able to tell if a cup roughly fits that requirement. Or you just get one designed for baking. Just as widely available as kitchen scales. Or you keep weighing your food. I don’t know what else to tell you.