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To make the experiment we need a glass, water, oil, alcohol, some nails and a piece of cork white.

First fill one third of the glass with water and then add the oil.

We see that the oil floats on water.

Then the alcohol is added carefully so do not mix with water.

We see that the alcohol floats on oil.

In this way we have three liquids in the glass. Water and alcohol are mixed but the oil that hinders touch.

For the second part of the experiment nailed a few balls of cork of different volume in each nail. When we prepared the Rato nails we let them fall into the glass.

We see that some nails sink to the bottom or glass, others remain floating on the surface of alcohol and others remain floating on the water.

Explanation

The water is denser than the oil itself is denser than the 'alcohol. That is why the oil floats on water and alcohol on the oil.

A nail sinks to the bottom of the cup and ball cork floats on alcohol.

nail the nails in the balls we can arrive at an intermediate density and some nails that remain floating on the water and others on oil.