How can you determine the relative density of a body using Archimedes’ principle?

According to Archimedes principle, when a body is partially or totally immersed in fluid, it experiences an upthrust force which is equal to the weight of fluid displaced.

The relative density of any substance is the ratio of density of that substance and water at 4°C.

In other words,
…(1)F

The first requirement is to know the density of the object.

From eq. (1),

Relative density =

Now,

The weight of a given volume of substance is the same as the weight of substance in air.

And, the weight of an equal volume of water is the same as the weight of water displaced (we are calculating relative density here, so liquid has to be water)

Example:

Here,