Fill the jar three-quarters full of water. Add drops of food coloring until you like the color you see. A few drops go a long way. Sprinkle with glitter for extra sparkle. Fill the jar almost to the top with the oil and let the mixture separate. Pour salt into the jar until you see the cool lava lamp effect. When the bubbles stop, add more salt to see it again. Shine a flashlight behind the jar to watch your lava lamp glow. The scientific reason behind this is that Oil and water do not mix because they cannot form any chemical bonds with each other. Water is made up of highly charged, hydrophilic compounds while oil is made up of long chains of carbon that are hydrophobic The long chains of carbon that make up oils do not carry a charge and are not attracted to the water molecules. This causes the separation we see in this experiment as well as in our kitchen sinks and oceanic oil spills. Furthermore, the oil will float on top of the water because it is less dense than oil.
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