Skip to Content

Colorful Rainbow Density Jar Science Experiment for Kids

Save this idea for later so you don't forget to use it!

With the rainbow density jar experiment learn about the density of various liquids in a fun, colorful way! That’s why we love our rainbow science experiments!

Kids will love mixing the colors, adding layers to their rainbow density jar, and watching to see which layers fall to the bottom, and which rise to the top.

Drop in coins and other objects of varying weights and see where they stick among the layers to make this a STEM activity.

With the rainbow density jar, learn about the density of various liquids in a fun, colorful way! Science has never been so happy!

This fun rainbow density jar is a quick way to explain the concept of density to kids. Kids will love making and observing the liquids in the rainbow density jar.

How to Make a Rainbow Density Jar- with science explanation!

Follow along with these directions to learn how to make a rainbow density lab.

How a Density Jar Works

With the rainbow density jar, learn about the density of various liquids in a fun, colorful way! Science has never been so happy!

This science experiment is a quick and easy demonstration of density. Density is how much mass is contained in a volume of measurement (D=M/V). Density is the measurement of how closely molecules are packed together in a given material (in this case, liquids).

If the mass of a liquid increases but the volume is the same (as is the case with this experiment), the density increases. Honey has molecules that are the closest together, while shaving cream is the least dense material.

Try adding various objects from around the house to see which are more or less dense than the liquids in your jar.

elementary stem challenge cards

What you need to make a rainbow density jar

Step-by-Step Directions to make a Rainbow Density Jar

Pour about 1/3 of a cup of each liquid into six small bowls.

Add color to each of your materials. Make the shaving cream red, the water orange, the soap yellow, the maple syrup green, the corn syrup blue, and the honey purple.

With the rainbow density jar, learn about the density of various liquids in a fun, colorful way! Science has never been so happy!

Add the liquids to the jar in reverse order (purple, blue, green, yellow, orange, red).

Wait about an hour to allow the colors to settle.

Place your jar in a sunny location to see all the layers.

With the rainbow density jar, learn about the density of various liquids in a fun, colorful way! Science has never been so happy!

Let your kids observe what happened to the liquids. Why are they not mixing with one another? Honey is the densest liquid, while shaving cream is the least dense. Let the kids try to figure out why the shaving cream is so much less dense than the honey.

elementary stem challenge cards

More Fun Rainbow Science Experiments

Flip a Rainbow Light Refraction Experiment

Rainbow Salt Circuit Engineering Activity

Fizzing Rainbow Experiment

Rainbow Soda and Mentos Experiment

Save this idea for later so you don't forget to use it!