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You can place a string around the head, and then measure the string. Or measure directly with a measuring tape, if you have one that is flexible enough (basically, a measuring tape made up of cloth or something similar).
The circumference of a circle measures the distance around the circle.
what is the average head circumference of a 5 year old boy
There is no such specific unit of measure as a circumference - a circumference is merely the distance around something.
Circumference is a linear measure and has no volume - just as a straight line has no volume.