Two objects of different materials are completely immersed in water. If both objects experience the same buoyant force, then they must have the same _______.
Upthrust, or more properly called buoyant force, is the upward force that acts on a body when it is partially or wholly immersed in a fluid (liquid or gas), and the property of the fluid to do this is called buoyancy.
One interesting characteristic of upthrust is: The larger the submerged volume of a body in a fluid, the more the upthrust exerted by the fluid on the body is.
In other words, in the same fluid for two different bodies to feel the same upthrust, they must be possessing the same volume. Note that the depth of submergence does not affect the buoyant force but only the volume of the body submerged and the density of the fluid will.