What is Buoyant force

is an upward force exerted by a liquid, gas or other fluid, that opposes the weight of an immersed object. In a column of fluid,

If the object’s density is less than the density of the fluid, the object will float. As the object is placed into the column of fluid, it will move downward, until the buoyant force is equal to the weight of the object. As the object moves downward, it pushes the fluid out of its way. This causes the top surface of the fluid to rise.

The volume of fluid, which the object has displaced by the object, is equal to the increase of fluid volume in the column. The weight of the displaced fluid is equal to the buoyant force.

In an experiment in physics class, the students placed an object into a graduated cylinder, container water. They measured the increase of the volume of the water. The increase of the volume of the water is equal to the volume of the object, which is under the surface of the water.

The buoyant force is equal to the weight of the increase of the volume of the water.

If the density of the object is greater than the density of the fluid, the object will sink. The buoyant force is still equal to the weight of the increase of the volume of the water.

Another method of determining the buoyant is shown at the website below.
http://resource.rockyview.ab.ca/rvlc/sci…

You weigh the object before placing it in the water, and while it is in the water.
The buoyant force is the difference of the two weights.

I hope this information is helpful.