Sink Oil in Water – Fun Science Fair Project


The aim of this science fair project is to see if oil can sink in water.

Materials Required:

  1. A tall transparent glass
  2. Thick oil
  3. Salt

How to Sink the oil

  1. Add water to the glass
  2. Now pour olive oil into the water. As usual it will float. Continue pouring till you get a 1cm thick layer of oil over the water.
  3. Sprinkle the salt on the top of the oil
  4. Observe what happens.
You will see the layer of oil sinking in water and then returning to the top after some time. This happens because oil tend to cling to salt which is heavier than both it and water. As a result the oil sinks in water. But after sometime the salt sink in oil, as it is heavier, thereby loosing its contact with the top layers of oil. So the top layers of oil becomes free and floats back to the top.