![]() In an internal combustion engine or industrial furnace, the air–fuel ratio is an important measure for anti-pollution and performance-tuning reasons. These are known as the lower and upper explosive limits. Typically a range of fuel to air ratios exists, outside of which ignition will not occur. ![]() The air–fuel ratio determines whether a mixture is combustible at all, how much energy is being released, and how much unwanted pollutants are produced in the reaction. The combustion may take place in a controlled manner such as in an internal combustion engine or industrial furnace, or may result in an explosion (e.g., a dust explosion, gas or vapor explosion or in a thermobaric weapon). ![]() Air–fuel ratio ( AFR) is the mass ratio of air to a solid, liquid, or gaseous fuel present in a combustion process.
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