Fire is the rapid oxidation of a material in the chemical process of combustion, releasing heat, light, and various reaction products. The flame is the visible portion of the fire and consists of glowing hot gases. If hot enough, the gases may become ionized to produce plasma. Depending on the substances alight, and any impurities outside, the color of the flame and the fire's intensity will be different.
Fire in its most common form can result in conflagration, which has the potential to cause physical damage through burning. Fire is an important process that affects ecological systems across the globe. The positive effects of fire include stimulating growth and maintaining various ecological systems. Fire has been used by humans for cooking food, generating heat, signaling, and propulsion purposes. The negative effects of fire include water contamination, soil erosion, atmospheric pollution and hazard to human life. A person who has the ability to control fire, or transform into it or create it, is referred to as a Pyrokinetic. Martians have a fear of fire, as it is their weakness. Fire is often extinguished with water.