Oxygen in the Air

We had fun doing this experiment in the effort to discover that burning seems to used up part of the air. Scientists in the 18th century performed experiments with air trapped in a glass turned upside down in water.

As the candle burns, oxygen from the air combines with the elements carbon and hydrogen from the candle to form carbon dioxide and water. When the oxygen in the jar has been used up, the candle can no longer burn. The carbon dioxide and water take up less space than the oxygen did, so the water rises.

The happy boy with the cars.
Even the cars joined the experiment too. hahaha.