What is Buoyancy ?
Buoyancy is the upward force caused by a fluid, such as water. This concept helps to explain why some things float while other objects sink. Buoyancy is an important factor in the design of many objects and in a number of water-based activities, such as boating or scuba diving.
This same idea helps to determine what will float in water and what will sink. If an object
weighs more than the weight of the water it displaces, it will sink. If the object weighs less, it will float. This helps explain why a heavy ship can easily float in the water, while a much smaller and lighter brick will sink quickly. It isn’t the size or shape of an object that primarily determines buoyancy, but the relation between an object’s weight compared to the weight of the water the object displaces.