Along time ago an Ancient Greece there was a great mathematician
named
Archimedes.One day when he was taking a bath he discovered something life changing.When he got in some water got displaced and it overflowed over the bath tub.Archimedes discovery got him thinking.He was so excited that he run thru the streets without any clothes on shouting Eureka Eureka.This meant i have found it in Greek.Archimedes figured out that if you put something in water and it light is then the amount of water being displayed the object will float.This is known as buoyancy or the Archimedes principle.So if an the object can float it is buoyant.