Fire (in professional terms) is a combustion reaction between oxygen and fuel, creating heat and smoke. The heat obtained from the reaction may prolong or prevent the risk of hypothermia. Lighting a fire without a lighter or a match, for example using natural flint and a rock or metal with burnt material, is a frequent subject of both books. on survival and in survival courses, often due to a lack of raw materials to indicate if an individual has been trapped. There is an emphasis on exercising fire-making skills before venturing into the wilderness. Producing fire under adverse conditions has been made much easier by introducing tools like a solar lighter and a fire plunger.
Fire is initiated with a concentrated heat, as in the case of a solar spark, or through a spark, as in the case of a flint hitting rock or metal. The flame will usually be blown out if there is excessive wind (such as an overheating fan or strong wind) or if the fuel or environment is too wet to ignite the fire.