This 3 sentence document discusses Archimedes' principle for calculating the upward force of buoyancy. It states that the upward force (Fa) of an object submerged in a fluid equals the density (ρ) of the fluid times the volume of the object (V) times gravitational acceleration (g). The variables are defined as Fa being the upward force in Newtons, V being the volume submerged in cubic meters, ρ being the density of the fluid in kilograms per cubic meter, and g being gravitational acceleration in Newtons per kilogram.