Lava lamps are a simple but great fun science activity for kids and use simple materials you probably already have in your kitchen cupboards. We’ve given these a Christmas twist by decorating them like a reindeer and a snowman. Crafts are not my strong point, so I’m sure you can do a much better job with yours.
We’ve also got a FREE Christmas Lava Lamp Printable you might find handy.
Don’t forget to check out our Christmas Science Ebook to,o which contains 12 printable Christmas themed experiments.
How to make a Christmas Lave Lamp
What you need
A clear plastic bottle or jar
A bottle of vegetable oil
Food colouring, glitter and decorations
- Fill the bottle or jar a quarter full with water and added a few drops of food colouring. You could even add a bit of glitter for extra sparkle.
- Fill up to (near) the top with the vegetable oil. The oil and water should separate into two layers, water at the bottom and oil sitting on top.
- Decorate your jar.
- Pop in half an alka seltzer tablet and watch the bubbles form. Add more alka seltzer bit by bit to keep the bubbles rising and falling.
Why do oil and water not mix?
See our original lava lamp post for a full explanation.
Why does the oil sit on top of the water?
The reason that oil rests on top of the water rather than underneath is because it has a different density to water, water is denser and so sinks to the bottom.
Why does the lava lamp bubble?
As the alka seltzer is added (this is made of citric acid and sodium bicarbonate) it reacts with the water and form carbon dioxide gas and Sodium citrate. It is the carbon dioxide bubbles that carry the coloured water to the top.
Can you make a Santa themed lava lamp?