How do you calculate the force of buoyancy?

3 Answers
Jun 8, 2018

Using F_b=rhogVFb=ρgV

Explanation:

F_b=rhogVFb=ρgV

Where,

F_bFb is the buoyant force
rhoρ is the density of the fluid
gg is the acceleration due to gravity (~~9.81ms^-29.81ms2)
VV is the volume of the fluid the object emerges in.

The buoyancy force is the upward force acting on an object that is caused by a displaced fluid. The more fluid that's displaced, the greater the buoyant force is.

If an object is fully submerged in the fluid, it experiences the maximum buoyant force. This also results in an increase in pressure.

Pressure = (mass)/(Volume)Pressure=massVolume (Pa)

So if the pressure increases, then the volume would decrease as the volume is inversely proportional to the pressure.

F_B=\rho V gFB=ρVg

Explanation:

If VV is the volume of a solid body submerged in the fluid of density \rhoρ then the buoyant force F_BFB acting on the body will be equal to the weight of fluid displaced by the body which is partially or fully submerged into the fluid.

The buoyant force F_BFB is given as

F_B=\text{weight of fluid of volume V & density}\ rho

=\rho V g

Jul 21, 2018

For a floating object, the "force of buoyancy" = "its weight".

Explanation:

Other answers focused on a submerged object. For a floating object, the "force of buoyancy" = "its weight".

I hope this helps,
Steve