Depends on whether u just stare at it and measure it or you actually use it to color or draw.
Its shadow will be 50 millimeters in length, if you lay it down on a flat surface.
25.4 millimeters = 1 inche
73%
Yes
You could measure its length and diameter in inches or millimetres, according to the usage of your country. And similarly for the mass, the units would be grams or ounces. The colour you could describe as the coordinates on a tri-stimulus colour diagram.
The rectangle.
You don't - millimeters is length.
The ideal length in millimeters for a number 3 haircut is typically around 9.5 millimeters.
millimeter
A number 1 haircut typically has a length of 3 millimeters.
A number 5 haircut typically has a length of 16 millimeters.
There are no millimeters in any liquid. -Millimeters measure length.