Why don’t oil and water mix? The answer starts with “molecules.” Molecules are the really tiny corpuscle that make up everything. Some substances are made the a most molecules. They space heavier, or much more dense, than others. Think of paper cups v marbles in them. One cup has four marbles. The other cup is half-filled v marbles. The marbles in the half-filled cup space close together. That’s referred to as density, and it is heavier.

You are watching: Water is more dense than cooking oil


Water molecule are just attracted to water molecules. Oil molecule are just attracted to other oil molecules.

Water is an ext dense (heavier) 보다 oil for this reason they can’t mix. Oil floats above the water.

See what that looks choose in this basic experiment.

Four ingredients:


food coloring

food preparation oil

table salt


Step 1: fill a glass around two-thirds full with insanity water.

Step 2: Add a couple of fall of food coloring and stir.

Step 3: Add food preparation oil to nearly fill the glass. Watch carefully!

Now because that the really neat part!

Step 4: Use a salt shaker to to water salt end the mixture. Watch the oil fall and also rise. Continue including salt to save the activity going.

What is happening? here’s the science:

Salt is much more dense (heavier) than oil or water so it is going to sink. Together the salt sink it pulls blobs the oil down with it. Once the salt starts come dissolve, it releases the oil. The oil rises back to the surface. You obtain dancing oil!




Learn an ext about the thickness of oil in the following experiment.



Make a Rainbow in a Jar



1) Honey

2) irradiate corn syrup (add food coloring)

3) Blue or green dish soap

4) food preparation oil

5) Rubbing alcohol (add food coloring to contrast with the dish soap)


You’ll additionally need:

A high clear container v a tight-fitting lid

A pipette or a drink straw

A irreversible marker or grease pencil


Step1: Prepare her container.Measure the elevation of her container and divide by six. Provide the oil 2 times together much an are as the other ingredients. Mark the parts on the container with the marker.

Step 2: Prepare your ingredients.Determine your color scheme and add food coloring come the clean liquids. Note: food preparation oil is not clear, and also it i will not ~ mix v food coloring.

Step 3: slowly pour each ingredient in the order they are listed above. Aim for the center of the container as you pour ingredients 1 with 4.

Don’t to water number 5 into the center! The alcohol demands to be tenderness dripped down the inside wall of the container making use of a pipette or a drinking straw. (See exactly how to usage a straw as a pipette below.)

Something unexpected is going to happen! check out if you have the right to guess by looking in ~ the perfect Rainbow in a jar photo.

What is happening? this is the science: The liquids continue to be separate because their densities space different. The ingredient are added in stimulate so that the most thick liquid is ~ above the bottom. Oil is the least thick of the liquids, so it floats to the top.

How to usage a straw together a pipette: Put one end of the straw right into the alcohol and cover the other finish firmly with your finger. This creates a small vacuum that holds liquid in the straw. Lift your finger native the straw to relax the fluid to slowly transfer fluid from one container come the other.

See more: What Kind Of Fish Is Gill From Finding Nemo ? What Types Of Fish Are In Finding Nemo




See all the activities in our science library. Click here!


Don’t miss the fun! experiments should constantly have parental participation.



Click right here to visit our source Library. You’ll find activities and advice to assist you prepare your kid for life.