The ability of objects to float, or buoyancy, comes from relative densities of the object and the fluid medium, whether it is water, air, or another liquid. When an object is immersed in fluid, it displaces an equivalent... More »

Objects comprised of material that is denser than water tend to sink; objects with a lighter density tend to float. Since air is lighter than water, hollow objects can float if their total density is less than water. Pre... More » Science Physics Motion & Mechanics

Objects sink into water until the weight of water displaced is equal to the weight of the object. If the water weight that is displaced is less than the object’s total weight, the object sinks. More »

To make an object float, find a sealed container, attach the container to the object, and place the object in a fluid. Objects float when they are positively buoyant, or less dense than the fluid in which they are sittin... More » Science Physics

Buoyancy is an objects ability float in a liquid and it is measured in terms of buoyant force, which is calculated with the following formula: buoyant force = pressure times area. Archimedes' principle is used to explain... More » Science Physics

People float because their bodies, especially with lungs filled with air, are less dense than the surrounding water. If an object weighs less than its equivalent volume of water, it floats, and if it is heavier, it sinks... More » Science Physics

Objects float when they have a density less than water. Some natural objects that have a density less than water include oil and wood. More » Science Physics