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How to Make a Spooktacular Halloween Density Jar

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For this experiment, give the traditional density jar science experiment a Halloween twist by making a Halloween density jar!

Halloween.

It’s a spooky season for witches, skeletons, and, STEM activities?

Halloween can be the BEST time for science and STEM, just because creepy science is so much fun! Halloween STEM activities for middle school are a brilliant way to show kids how science can be cool.

Halloween science experiments and Halloween STEM activities are super fun! This Halloween density jar is a simple science experiment kids will love!

Kids will love dropping spooky objects into liquids and seeing how far they go down into the depths.

It’s also a fun way to teach density in a jar to kids!

This Halloween density jar is a simple science experiment kids will love and shows how density in a jar illustrates liquid density.

Don’t miss the complete list of Halloween science experiments!

How to Set Up the Halloween Density Jar Experiment

A density jar is a fun way to learn about the density of objects, and have fun with science at the same time. You probably already have everything you need to make this density jar right now.

What you need for the Halloween density STEM activity:

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Halloween science experiments and Halloween STEM activities are super fun! This Halloween density jar is a simple science experiment kids will love!

What is density for kids

halloween density in a jar experiment

A density jar is an easy way to show kids how even though liquids can take up the same amount of volume (or space), they have different levels of mass (or weight).

The denser a liquid is, the more it will sink to the bottom. Denser liquids have molecules that are packed closer together.

You can use this science demonstration to show how different objects can have different levels of density, even if they are different sizes.

halloween stem challenge cards

How to do the Halloween density experiment for elementary students

halloween density jar experiment

Dye the water orange with food coloring. Don’t dye the other ingredients.

Put your syrup in the bottom of the jar first.

Halloween science experiments and Halloween STEM activities are super fun! This Halloween density jar is a simple science experiment kids will love!

Add the water next, and finally, the oil.

Halloween science experiments and Halloween STEM activities are super fun! This Halloween density jar is a simple science experiment kids will love!

Have the kids drop the toys into the jar one at a time.

Let the kids guess where they think the objects will land.

halloween density jar science experiment

The densest objects will descend all the way to the bottom of the jar.

The least dense objects will be floating at the top.

Halloween science experiments and Halloween STEM activities are super fun! This Halloween density jar is a simple science experiment kids will love!

Our favorite object was the spider, that was heavier than the oil but floated on top of the water. It made our Halloween density jar quite creepy!

Use this time to talk about the density of liquids and objects with kids. What makes one liquid denser than another?

What happens if you mix up the jar? Will the ingredients separate again?

What makes the eyeball float on the top of the jar?

More Halloween Science Experiments

halloween density stem activity

If you love Halloween science and this Halloween density jar experiment, then you’ll love trying out these Halloween science experiments!

We also have Halloween STEM activities for kindergarten, Halloween STEM for first grade, Halloween STEM for 2nd grade, Halloween STEM for 3rd grade, Halloween STEM for 4th grade, Halloween STEM ideas for 5th grade, and middle school Halloween STEM activities!

Jello Worms

Salt Crystal Witches

Skull Slime

Find more amazing Halloween STEAM activities in the Spooky Science e-book!

 halloween stem challenges 

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