chapter  2
29 Pages


Fuel gases burnwhen they are ignited and allowed to combinewith oxygen, usually taken from the air. This burning or ‘combustion’ is in fact a chemical reaction taking place, a reaction which produces heat and changes the gas and air into other gases. In order to understand what exactly is taking place and what new substances are being produced by the combustion, it is necessary to study a little very simple chemistry. Start by looking at atoms and molecules in a little more detail.