Fizzy fountain
You will need:
- empty plastic bottle
- jug
- vegetable oil
- water
- food colouring
- two effervescent tablets (containing citric acid and sodium bicarbonate)
Method:
- Pour the vegetable oil into the bottle until it’s about three-quarters full.
- Use a jug to top up the last bit with tap water. The oil will float on the shallower layer of water.
- Add a few drops of food colouring. For best results, use a few drops of two or three different colours. The colouring will take a few moments to travel through the oil, before slowly mixing with the water.
- Break the two effervescent tablets in half and drop them into the bottle. They should start to fizz up immediately.
- Loosely screw the bottle top back on and watch your fizzy fountain start to work.
How does it work?
Research: why does oil and water not mix
