He also demonstrated that the gas could be ignited with an electric spark. It explodes and Doris is ignited in flames. The spark ignited hydrogen on the outer skin. Again, it is ignited with a spark plug. Lincoln's response ignited a firestorm of emotion. As the fuel passes through the flame, it is ignited and propelled towards the target. Despite the lack of any fire from the torch the ceremonial flame still ignited. Gunpowder canisters were ignited to create rocket jets. Regardless, the spark of music had ignited, and many other sound camps would follow. The supplies are ignited by the fire and explode. Not surprisingly, "How Children Fail" ignited a firestorm of controversy. The air ignited the hot graphite and started a graphite fire. Great White accidentally ignited flammable soundproofing foam. Before the chorus, the leather jacket was simply ignited and burned. Aerosols of flammable liquids may be ignited well below their flash point.