The extintor

Material:

- Sodium bicarbonate.

- Vinegar.

- A glass.

-Matches

- A candle

Frame up:

Put inside a glass a little of vinegar ( three or four centimetres)
Add a little sodium bicarbonate. Then many bubbles appear.
Light a candle with a match. If you tilt the glass without spilling vinegar, we see that the candle puts out.


Explanation:

The chemical reaction between sodium bicarbonate and acid vinegar producers a gas called Carbon Dioxide. This gas is heavier than the air and it stays in the glass by moving the air in the glass.
When you put the candle next to glass it´s turned off by the lack of oxygen. When you tilt the glass, it´s put out because the carbon dioxide, displace the oxygen that retain the combustion.

by José Ángel and Miguel