Combustion, in essence, is a series of chemical reactions that generate heat. For these reactions to occur, the fuel needs to be above its ignition temperature. Carbon + oxygen → carbon dioxide and heat. Hydrogen + oxygen → water and heat. A chemical process in which a substance reacts with oxygen to give off heat is called combustion. The substance that undergoes combustion is said to be combustible. It is also called a fuel. The fuel may be solid, liquid or gas.

Combustion is a chemical reaction that occurs when a fuel reacts with oxygen, resulting in the release of heat and light energy. It is a type of exothermic reaction, meaning it releases energy in the form of heat.

During combustion, the fuel molecules break apart, and their atoms combine with oxygen atoms to form new molecules. This process is called oxidation. The most common example of combustion is the burning of fossil fuels, such as gasoline, coal, and natural gas.

The reaction can be represented by the general equation:

Fuel + Oxygen → Carbon Dioxide + Water + Energy

The released energy can be harnessed to perform useful work, such as powering vehicles or generating electricity. However, incomplete combustion can also occur when there is limited oxygen supply, resulting in the release of harmful byproducts such as carbon monoxide and soot.

Combustion is influenced by several factors, including the availability of fuel and oxygen, temperature, and the presence of a catalyst. The efficiency of combustion processes can be improved by optimizing these factors and ensuring complete oxidation of the fuel.

In summary, combustion is a chemical reaction that involves the reaction of a fuel with oxygen, resulting in the release of heat and light energy. It is a fundamental process that plays a crucial role in various applications, including heating, transportation, and energy production.