If you observe some of our friends, they don’t get along with each other. It is the same between oil and water. Even if we try mixing water with oil, they don’t mix well. Not just oil and water, there are a few liquids which don’t get along with each other. Let’s see it by ourselves.
Try it yourself
- A plastic bottle (similar to 250 ml Coca Cola or Pepsi bottle)
- ½ cup of vegetable oil
- ½ cup of water
- Food color
- Dish washing liquid
Step 1: Mix a food color (be it red, blue, or green) with water and pour the colored water into the plastic bottle.
Step 2: Pour in the vegetable oil, screw the cap on tight and shake the bottle well.
Step 3: Keep the bottle on a table for some time and see what happens. Note your observation.
Step 4: Now pour in some liquid dish washer and shake the bottle once again.
Step 5: Repeat step 3
Water goes well with many other liquids but not with oil. Even if we try mixing water with oil, they don’t mix well. At step 3, we notice that the oil and water stays separate. They do not mix each other. There are some liquids which do not mix and they are known as immiscible.
Water has a high attraction between its own molecules. This is the same for oil as well. This tendency of water and oil makes them to stay away from each other. As the density of water is higher than oil, it allows oil to float over the water.
When you mix liquid dish washer, it has the property to mix with both oil and water. This will help the three liquids to join them all together. The new mixture is known as emulsion. To be clear, emulsion is a mixture of two or more liquids that are normally immiscible.