Thickness is measured in units of length. You'd have to choose the one that gives
a reasonable number corresponding to whatever you're measuring the thickness of.
If it's the thickness of a hair, you'd probably select a sub-multiple of a meter. If it's
the thickness of the atmosphere, you might select the kilometer. If it's the thickness
of country gravy, that's a whole different story.
You would use milliliters (mL) to measure the capacity of a paper cup.
one of those kitchen mini-scale thingies
Measuring cup
inch
Millimeters is a measure of length while a cup is of volume. Try changing one unit to another of the same measure, i.e., volume to volume like liters and a cup.
Ounces or milliliters.
You would use millimeters for the measure of the capacity of a paper cup.
centilitre
Kilograms, or grams.
You would use milliliters (mL) to measure the capacity of a paper cup.
A cup
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Probably millilitres or fluid ounces.
Measuring cup
one of those kitchen mini-scale thingies
Volume of cup ca be measured in milliliter. It can also be measured in decimal liter.
A millilitre (or equivalently, a cubic centimetre), a centilitre.