Final answer:
The buoyant force concentrates its upward thrust at the center of buoyancy, which is determined by Archimedes' principle as the point through which the force of buoyancy appears to act on an object submerged in a fluid.
Step-by-step explanation:
The place where the buoyant force concentrates its upward thrust on an object immersed in a fluid is known as the center of buoyancy. This is a position within the object where the cumulative effect of the upward pressure exerted by the fluid acts, essentially the point through which the force appears to act. According to Archimedes' principle, the buoyant force is equal to the weight of the fluid displaced by the object. The magnitude of this force is determined by factors such as the object's volume and the density of the fluid.
When an object is placed in a fluid, if the buoyant force is greater than the object's weight, the object will float. Conversely, if it is less, the object will sink. The concept of specific gravity is also related to buoyancy, defined as the ratio of the density of an object to that of a reference fluid, typically water.