Butane, propane and liquefied petroleum gas are widely used today. They are pressurized and filled into the air storage tank. Once released into the air, they will absorb heat, gasify and expand rapidly, which is very easy to ignite. The most primitive lighters were derived from flint ignition guns. When the trigger with spring is pulled, it hits the flint to produce sparks and ignite the dry leaves. The ancestor of modern lighters can be said to be the tinder box in Europe in the 16th century and the chuck-muckrs lighter box. They both work on the same principle. They both ignite the tinder by using the spark generated by the striking iron. The difference is that the tinder of the tinder box is tied to one side by a chain, while the tinder box is completely integrated. The latter is Chinese. When the world's first pistol came out soon, the first early lighter appeared, because it was changed from a pistol, called a velvet pistol. This lighter has also long been used as a symbol of i…