Bottle Bubbles

Bottle Bubbles
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WHAT YOU NEED:

- 1 clear plastic bottle
- Jug of water
- Vegetable oil
- Food colouring
- An effervescent tablet – must contain citric acid and sodium bicarbonate

WHAT TO DO:

1. Pour vegetable oil into your bottle until it’s about ¾ full.Use your jug of water to top up the last bit with water.The water will sink to the bottom of the bottle and the oil will float on the layer of water.
2. Add a few drops of food colouring – it will take a few moments to sink through the oil before it mixes with the water.
3. Break your effervescent tablet in half and drop the two halves into the bottle.
4. Loosely place your bottle lid back on the top of the bottle and watch your bottle full of colourful bubbles!

The Extreme Science behind this:

Water is heavier than oil, which is why it sits at the bottom of the bottle.When the effervescent tablets are dropped in bottle and hit the water and start to dissolve, they begin to fizz.The fizzing is bubbles of carbon dioxide gas which begin to rise through the bottle.The bubbles attach themselves to little blobs of water which they carry up with them to the top of the bottle.When the bubbles reach the surface, they pop, so without a bubble to keep them floating, the little blobs of water sink back down to the bottom.

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