Circumference = 2*pi*r
r(radius) * 2 = diameter
So. assuming the bottle is fairly a circle, measure across the bottom to get the diameter and then divide that in half for the radius and use the circumference formula. Of course a bottle is not quite a perfect circle everywhere and you might need calculus to get a proper circumference. I am thinking vector calculus.
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The circumference of a circle measures the distance around the circle.
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.
The circumference is the distance around a circle and it is measured by:- Circumference of a circle = 2*pi*radius or pi*diameter
A tape measure.