This experience is the result of a combination of several phenomena that we'll explain here.
How it works
First, there is the candle that consumes oxygen, as we have seen here: combustion and releases carbon dioxide that dissolves in water.
Then there was the candle which heats the air contained in the glass. When it goes off, the air cools abruptly and takes up less space, we say that condenses here as: expansion and contraction of the air .
If the air takes up less space, the water is sucked through the air pressure that we observed in this experiment: the atmospheric pressure .
- A tea candle
- A plate
- A glass
- Some water
How do the experiment
- Pour a little water on the plate. If there is too much water the experience will not work correctly.
- Ask an adult to light the tea candle and place on water.
- Then ask him to cover the candle with a glass.
- Now you can see that when the candle goes out, the water rises in the glass.