Science Day / Homemade Lava Lamps
Homemade Lava Lamps
Children layer oil and coloured water in a bottle, then drop in a fizzing tablet to make bubbly blobs rise and fall.
How to run it
- Fill a clear bottle a quarter with water and add food colouring.
- Top up with vegetable oil and wait for it to separate.
- Drop in a piece of fizzing tablet.
- Watch the blobs rise and talk about why oil and water do not mix.
You will need
- clear plastic bottles
- vegetable oil
- water
- food colouring
- effervescent tablets
- tray
Make it easier or harderYounger children watch and describe, while older children test different liquids.
SafetyStore tablets away from children and supervise to prevent drinking.
My Time Our Place · Outcome 4Children observe and explain density and reactions.
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