By Its Buoyance.
prone float, supine float,
jack hammer float
Float...
No they do not float they sink right to the bottom so if I was you I wouldn't use them to go swimming with.
It is when you float face down without any movement of the arms or legs.
A cork has a low density. It is lower then water. That causes it to float.
floaty float
Yes
A supine float is floating in the water on your back with head above water.
You float face down in the water. You only move to get air.
Buoyancy