mL
mL.
A centilitre, probably.
Millimetres
I am unsure as to what the questions regards as far as measurement goes, but I can say that all aspects relating to the construction and flight of paper airplanes can be measured.
A4 is 210 mm by 297 mm.
You would use millimeters for the measure of the capacity of a paper cup.
mL.
A centilitre, probably.
Millimetres
The capacity of a paper clip is milligrams positive
If you're talking about the dimensions of an A4 sheet of paper. In metric it's 210mm x 297mm. In imperial it's approximately 8.27 x 11.69 inches.
I am unsure as to what the questions regards as far as measurement goes, but I can say that all aspects relating to the construction and flight of paper airplanes can be measured.
8.5x11
fl oz is the capacity of a small paper cup
5grams
Inches, usually, unless it is newsprint or bulk paper.
Microns, this is measured with a micrometer