Combustion principles refer to the chemical reactions that occur when a fuel reacts with an oxidant, typically oxygen, producing heat and light. This process involves breaking chemical bonds in the fuel and forming new bonds in the products, primarily carbon dioxide and water. The reaction can be classified as complete or incomplete, depending on the availability of oxygen. The efficiency of combustion is influenced by factors such as temperature, pressure, and the fuel-to-oxidant ratio. Proper mixing of the fuel and oxygen is essential for optimal combustion, as it ensures that the reaction occurs uniformly, minimizing harmful emissions like carbon monoxide and unburned hydrocarbons.