Why do womans brea'ts float?

Im very sorry if i upset anyone with this question, but i have always wondered why? can anyone shed any light on this?Why do womans brea'ts float?
Fat floats, and that's all breasts really are - just pockets of fat hanging off the front of the body.
Fat is lighter than water.
Their density is of a lower ratio to their size
cos fat floats on water.. oil n water never mix
Same reason that anything floats ; it's less dense than the environment that it is immersed in. AKA The Archimedes Principle
Because a breasts volume is mostly composed of fat and fat floats.
This is why female bodybuilders have either implants or flat, saggy breasts and why when a woman looses weight, her breasts become smaller and tend to sag.
Thier filled with air.
Never noticed that.