Has anyone else ever noticed that there it's not unusual for different measuring cups or measuring utensils to hold different actual amounts for what they call "one cup"?
When I put "one cup" of water into my pyrex measuring cup, then pour it into one of my nice metal measuring cups, I have some water left over! And when I pour "one cup" of water from either the metal measuring cup or the pyrex utensil into a chem lab glass flask that I have, it's different in the flask (as indicated on the measuring lines on the side of the flask).
A friend who's a chem professor told me that my flask is not a "volumetric" flask, even tho it looks like it came out of a chem lab.
This really irritates me. How hard, or how expensive, can it be for a manufacturer of a simple device like on of these, to get it right????