Working Principle - Density is amount of mass per unit volume.

Density is basic property of matter. Every substance has density that can be measured. If you were asked what is heavier, a Kg of lead or a Kg of feather. Your initial response would be “Lead”. But they both weigh the same. A Kg of feathers takes up more space whereas lead takes up much less space because of it greater density.
The aim of this experiment is to demonstrate the concept of density of various metals with feel.