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Home » Science Experiments for Kids » Density experiment – pirate themed

Density experiment – pirate themed

Modified: Mar 21, 2025 · Published: Mar 3, 2015 by Emma Vanstone · This post may contain affiliate links · Leave a Comment

I’ve got another fun pirate themed activity today, this time demonstrating density. Density is quite a hard concept to grasp but this is a really nice introduction and full of little wow moments.

Just the fact that the oil sits on the water is quite fun. We used blue water to make it look like the ocean and carefully poured oil over the top. 

Even if you shake the bottle to mix the oil and water, they will still separate again if left to settle.

Pirate themed density jar made with blue water and oil.

What you need to make a pirate density jar

Empty bottle or jar

Water

Oil – we used very cheap vegetable oil.

Pirate objects to test

Method

Half fill the container with water, then add some oil. The oil will sit on top of the water.

Carefully drop pirate objects into the jar. They will either float on the oil, float on the water or drop to the bottom.

Pirate themed density jar made with oil and water with an object floating on each layer.
Fun pirate themed density jar

We found our pirate coin sank right to the bottom.

The beads floated on the water, but not the oil.

The cork floated on the oil.

density experiment

See this post for a full explanation of density.

Extension Ideas

Test more objects, but this time, try to predict where they will end up.

More Pirate Activities for Early Years

Create pirate codes for friends to find treasure.

Hide pirate treasure in fizzy rocks.

Test different materials to make a pirate ship waterproof.

pirate themed density sensory bottle with blue water and vegetable oil
Pirate themed sensory bottle

Last Updated on March 21, 2025 by Emma Vanstone

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Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

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