The lighter is a small fire device. Mainly used for making fire, smoking, but also for cooking and other fire making. The main components of the lighter are the ignition mechanism and the gas storage box. When the ignition mechanism is in motion, it emits sparks to the gas area to ignite the gas. The ignition mechanism is the most active part in the evolution of the lighter, and it is also the part with a more complex structure. According to the characteristics of the ignition mechanism, lighters can be divided into 6 types: flint steel wheel lighters, piezoelectric ceramic lighters, magnetic induction lighters, battery lighters, solar lighters, and microcomputer lighters. The gas used by the lighter is mainly flammable gas. Gasoline was used in the early days. Nowadays, butane, propane and liquefied petroleum gas are mostly used. After being pressurized, they are filled into the air storage tank, and once released into the air, they absorb heat and vaporize and expand rapidly, making them easy to ignite.