Fire is a self-sustained combustion reaction characterized by the release of smoke, heat, light, or any combination of these.
Fire is an exothermic reaction, which means that heat is released during the process.
Fire is a chemical reaction called combustion, where fuel reacts with oxygen in the air and releases heat, light, and gases. It occurs when three elements — fuel, heat, and oxygen — come together, which is known as the fire triangle. When enough heat is applied, the fuel turns into vapour and combines with oxygen, producing flames that we see as glowing hot gases. Fire is an exothermic reaction, meaning it gives out energy, and we can observe it in everyday life, like a candle burning at home, wood burning in a fireplace, or sparks from welding at work.