The goal of the experiment:

Explain the difference between materials in terms of density

Tools:

Copper wire - piece of gold - platinum ingot - ice cubes - piece of coal - cork - paper - piece of wood - ruler - screw

Steps:

Put the materials in front of you in the tub and control the liquid density from the control on the side of the tub, and see what happens

Note:

We notice that some materials float and others sink, depending on the density of the liquid

Conclusion:

Substances differ from each other in terms of density

Experiment for yourself with Vlaby Virtual Science Worker platform

You can read more about how materials differ from each other in terms of densityhere.