How do heatwaves show physical and chemical changes

An example of heatwaves showing physical and chemical change is with a burning candle, when a candle burns, there is both a physical and chemical reaction.

The physical change is quite obvious and in fact, it can be seen. When the candle burns, the wax slowly melts and the candle gets smaller and smaller. This wax, as can be seen, will drip onto the candle and stick to it. When this wax forms back into a solid and stays on the candle, that is another physical change that can occur.

The chemical reaction can be a little less obvious. The first is that the heat produced by the candle consumes both the oxygen around it, as well as the fuels coming from the flame. This will then lead to carbon dioxide emissions produced by the flame, which by the way should never be inhaled. This is the chemical change that takes place in the reaction.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.