The molten, oxidizing sparks ignite the fine tinder. Lucifers could ignite explosively, sometimes throwing sparks a considerable distance. Match heads burn hot enough to ignite thermite. This fuse was lit, causing the gunpowder to ignite and propel the cannonball. Lithium will ignite and burn in oxygen when exposed to water or water vapors. Fine aluminium powder can ignite or explode, posing another workplace hazard. An explosive charge would then ignite the incendiary material, often starting a raging fire. Flammable materials are combustible materials that ignite easily at ambient temperatures. Insufficient energy is available to produce an arc that can ignite the surrounding explosive mixture. These lasers may ignite combustible materials, and thus may represent a fire risk. Hydrogen gas leaking into external air may spontaneously ignite. They ignite at and burn as hot as . Electrostatic discharges can ignite the fuel vapor. If a large deposit collects in one, it can ignite and create a chimney fire. Air Force One away, causing the fuel to ignite and destroying the tanker.