a centimeter
meters
Ounces or milliliters.
liters
In the US, I would use yards.
millimetres.
To measure the thickness of a nose hair, you would typically use micrometers (microns), which are one-millionth of a meter. This unit is appropriate as the diameter of a human hair is usually in the range of 50 to 100 microns. Using micrometers allows for precise measurement on such a small scale.
Cm
Feet.
A shoe.
You would use CM or INCHES to measure a knife
inches
meters
Kilograms.
inches
Centimeters
Kilograms.
Square footage.