A soup bowl
A narrow glass
We fill the plate with water
We light the candle and put into the plate so that the glass doesn´t touch the flame
We place a glass on the candle. We wait for a moment and we see that the flame goes out, and them comes into the water in the glass.
When we light the candle, it produces a combustion reaction: the wax of the candle reacts with the oxygen of the air and produces carbon dioxide and water steam. We can see that inside of the glass appear a few drops of water. It is the water steam produced in the combustion of a candle that is condensed in the walls of the containers.
In the reaction the gas is consumed, the oxygen that forms a part of the air, but other two are formed, the carbon dioxide and the water steam. The volume of the gas produced, is smaller than the volume of the oxygen that is consumed.
The results is that in the interior of the glass the pressure is reduced and because of that the water goes up until the interior pressure is reduced and because of that the water goes up until the interior pressure is equal to the interior one
by Amelia and Laura