Definition of Combustion
Combustion, commonly known as burning, is a rapid chemical process that produces heat and light. It's a type of exothermic reaction where a substance reacts with an oxidant, usually oxygen from the air, to release energy.
Key Components of Combustion
For combustion to occur, three elements, often called the 'fire triangle,' are typically required: fuel (a combustible material), an oxidant (like oxygen), and heat (to reach the ignition temperature). If any one of these is removed, the combustion process stops.
A Practical Example: Burning Wood
When wood burns, it acts as the fuel. Oxygen in the air is the oxidant, and an initial spark or flame provides the heat to start the reaction. The wood reacts with oxygen, producing ash, smoke (carbon dioxide, water vapor, and other gases), and releasing significant heat and light.
Importance and Applications
Combustion is fundamental to many aspects of modern life, from generating electricity in power plants and powering internal combustion engines in vehicles, to providing heat for homes and cooking food. It's a primary source of energy, but also a major contributor to air pollution.