Why don’t oil and also water mix? The answer starts with “molecules.” Molecules room the really tiny corpuscle that comprise everything. Part substances space made of a many molecules. They room heavier, or more dense, than others. Think of record cups with marbles in them. One cup has 4 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 also it is heavier.

You are watching: Cooking oil is more dense than water


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

Water is more dense (heavier) 보다 oil so they can not mix. Oil floats over the water.

See what that looks favor in this simple experiment.

Four ingredients:


food coloring

cooking oil

table salt


Step 1: fill a glass about two-thirds full with tap water.

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

Step 3: Add cooking oil to almost fill the glass. Clock carefully!

Now because that the really neat part!

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

What is happening? here’s the science:

Salt is an ext dense (heavier) than oil or water so it is going to sink. Together the salt sink it pulls blobs that oil down v it. Once the salt starts come dissolve, it releases the oil. The oil rises back to the surface. You acquire dancing oil!




Learn much more about the density of oil in the next experiment.



Make a Rainbow in a Jar



1) Honey

2) light corn syrup (add food coloring)

3) Blue or eco-friendly dish soap

4) cooking oil

5) Rubbing alcohol (add food colour to comparison with the food soap)


You’ll likewise need:

A tall clear container v a tight-fitting lid

A pipette or a drinking straw

A irreversible marker or grease pencil


Step1: Prepare her container.Measure the elevation of your container and divide through six. Give the oil two times as much space as the other ingredients. Mark the portions on the container through the marker.

Step 2: Prepare her ingredients.Determine your shade scheme and add food coloring come the clear liquids. Note: food preparation oil is no clear, and it won’t mix v food coloring.

Step 3: gradually pour every ingredient in the order they are detailed above. Aim for the center of the container as you pour ingredients 1 with 4.

Don’t to water number 5 right into the center! The alcohol needs to be gently dripped under the inside wall surface of the container utilizing a pipette or a drink straw. (See exactly how to usage a straw as a pipette below.)

Something unanticipated is going come happen! see if you have the right to guess by looking at the perfect Rainbow in a seasoned photo.

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

How to use a straw as a pipette: Put one finish of the straw into the alcohol and also cover the other end firmly v your finger. This creates a tiny vacuum the holds fluid in the straw. Lift your finger from the straw to release the liquid to progressively transfer fluid from one container to the other.

See more: What Is The Plus Sign With A Line Under It H A Line Under It Mean In Math?




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



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