Oil and water are two liquids that are immiscible – they will not mix together. Liquids tend to be immiscible when the force of attraction between the molecules of the same liquid is greater than the force of attraction between the two different liquids. In simpler terms, like dissolves like.
Although this experiment uses the same volume of oil as water, the two liquids have different masses and therefore, different densities. A liquid that is less dense than water will float on the water; a liquid that is more dense will sink. Density is a measure of how much of a substance is contained in a specific volume of liquid.
Oil and water will be used in graphic elements. Because They are never mixed up. So They are many potential as a graphic elements. And Also It can be dyed. So made a various colorful image.