In which liquid the buoyancy force acting on a piece of paraffin will be the smallest:

In which liquid the buoyancy force acting on a piece of paraffin will be the smallest: a) in water; b) in engine oil; c) in glycerin; d) in alcohol? why?

The buoyancy force of Archimedes is determined by the formula:

F = ρgV (ρ is the density of the liquid, g is the acceleration of gravity, V is the volume).

The factors g and V will be the same in all cases. The least buoyant force will be in the liquid with the lowest density.

Densities of liquids:

– water – 1000 kg / m ^ 3;

– machine oil – 910 kg / m ^ 3;

– glycerin – 1260 kg / m ^ 3;

– alcohol – 789 kg / m ^ 3.

Among the liquids listed, alcohol has the lowest density.

Answer: the least buoyant force will be in alcohol.