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Layer by Layer: Kitchen Oil Density Tower

Time needed: 30 minutes
Difficulty level: Medium
Age range: 10+ years
Adult supervision: Recommended
Density Tower

What You'll Learn

Create a colorful tower of liquids that stack on top of each other based on their densities. This experiment demonstrates how different liquids have different densities and why some liquids float while others sink.

Materials Needed

Materials collected: 0/11
Tall glass container
Honey
Corn syrup
Dawn dish soap
Water
Vegetable oil
91% isopropyl alcohol
Lamp oil (red)
Turkey baster
Food coloring (yellow, red, blue)
Test objects (metal screw, grape tomato, bottle cap, ping pong ball)

Safety Notes

Handle glass containers carefully
Food coloring can stain - wear old clothes or an apron
Keep paper towels handy for spills

Step-by-Step Instructions

1
Pour honey into the bottom of the container using the turkey baster
Be careful not to get honey on the sides of the container
Honey has the highest density and will form the base layer
2
Mix yellow food coloring with corn syrup in a separate container
Add the colored corn syrup on top of the honey using the baster
Avoid touching the container sides when pouring
3
Add Dawn dish soap (green) as the third layer
Use the baster and continue avoiding the container sides
4
Mix red food coloring with water in a separate container
Using the baster, let the water drip down the side of the container
5
Add vegetable oil layer (no coloring needed)
Pour down the inside wall of the container using the baster
6
Mix blue food coloring with 91% isopropyl alcohol
Add as second-to-last layer using the baster down the container wall
7
Add red lamp oil as the final layer
Use pre-colored red lamp oil as food coloring won't mix with it
8
Test different objects in your density column
Try a metal screw (sinks to honey), grape tomato (settles in dish soap), plastic bottle cap (rests on vegetable oil), and ping pong ball (floats on top)

Watch It In Action

Watch how each layer stacks perfectly when added carefully. Notice how different objects settle at different levels based on their densities.

The Science Behind It

Density is the measure of how much mass is contained in a given volume. Liquids with higher density sink below those with lower density.
The layers form because these liquids are immiscible (they don't mix) and have different densities: corn syrup is densest, followed by dish soap, water, and oil.
Objects float in layers where their density matches the liquid's density - this is called neutral buoyancy.

Common Questions

Why did my layers mix together?
This usually happens when liquids are poured too quickly or directly into the center. Try pouring very slowly down the side of the glass.
Can I use different liquids?
Yes! You can try maple syrup, glycerin, mineral oil, or different concentrations of salt water. Just remember that they need to have different densities to form layers, and some liquids might not be immiscible (they'll mix together).
How long will the layers stay separated?
If left undisturbed, the layers can stay separated for days or even weeks because these liquids are immiscible.

Take It Further

  • Try heating or cooling the liquids to see how temperature affects density
  • Experiment with different combinations of household liquids
  • Test various objects to create a density classification system
  • Add salt to water to change its density and position in the tower

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