Fire is a rapid oxidation process called combustion, releasing heat, light, and reaction products. Flames, the visible part, appear when fuel reaches its ignition point. Hydrocarbon flames comprise carbon dioxide, water vapor, oxygen, and nitrogen. Intense heat can ionize gases into plasma. Flame color and intensity vary with fuel type and surrounding gas composition.
In February 1915, during the First World War, German troops first used modern flamethrowers against entrenched French troops near Verdun.
In 1938, the use of fire lookout towers for early wildfire detection peaked.
In July 1944, towards the end of the Second World War, the incendiary fluid napalm was used.
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