Answer:
Firstly you must understand that buoyancy is the very thing that allows anything to float. Buoyancy is defined as the force applied to an object by the fluid it is in, the force is quivalent to the volume of the fluid that is being displaced by that object
Example
say you have an object with a volume equal to 1 metre cubed sumbersed in water
since the object is displacing 1 m^3 of water, 1000Litres = 1 m^3 , and 1L is approximately equal to 1kg. therefore the buoyant force would be 1000 kg of force upwards.
the more fluid is displaced by an object, the more buoyant that object will be