With a scale
Due to their small size, you would use millimeters to measure the length of an ant.
Millimeters
For an ant farm, I would suggest a kilogram. For an individual ant, a milligram.
Ants are generally measured in millimeters. However, if the ant being measure is five millimeters, it would measure about five million nanometers.
3 milligrams is the weight of an average ant.
Measure it and then you'll know
It is a millimetre.
the anwser is the leg .
A ruler
millameters
meter