Upthrust (Buoyant Force) = ρ * V * g

Where:

• Upthrust (Buoyant Force) is the force exerted on an object immersed in a fluid (liquid or gas) that opposes the weight of the object and pushes it upward.
• ρ (rho) is the density of the fluid in which the object is immersed.
• V is the volume of the fluid displaced by the object (the volume of the portion of the fluid that the object occupies).
• g is the acceleration due to gravity.