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How does the disposable lighter fire?

Update:15 Oct,2021
Summary: working principle1. StructureThe fuel used by the lighter is mainly combustible gas. In the early d...
working principle
1. Structure
The fuel used by the lighter is mainly combustible gas. In the early days, gasoline was mostly used, but it is rarely used now because of its peculiar smell. Nowadays, butane, propane and liquefied petroleum gas are mostly used. After being pressurized, they are filled into a closed air box, and once released into the air, they absorb heat and vaporize and expand rapidly, making them easy to ignite.
The butane (CH3-CH2-CH2-CH3) used in the lighter is n-butane, which is a collective name for two alkane hydrocarbons with the same molecular formula (C4H10). Including: n-butane and isobutane (2-methylpropane). Butane is a flammable, colorless, easily liquefied gas. It is an important raw material for the development of petrochemicals and organic raw materials, and its use has received increasing attention.

2. Performance
Colorless flammable gas. The melting point is -135.35℃, the boiling point is -0.5C, the relative density is 0.5730 (25℃), the refractive index is 13326 (20. C), and the critical temperature is 1520l. C, the critical pressure is 38OkPa, and the critical volume is 4387ml/g. Insoluble in water, easily soluble in ethanol, ether, chloroform and other hydrocarbons. It forms an explosive mixture with air, and the explosion limit is 19%~84% (V/V).

Extended information
The main components of the lighter are the ignition mechanism and the gas storage box. When the ignition mechanism is in action, it emits sparks to the gas area to ignite the gas.
The ignition mechanism is the most active part in the evolution of lighters, 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.
Modern lighters can be divided into liquid lighters and gas lighters according to the fuel used. According to the ignition mode, they can be divided into grinding wheel lighters and electronic lighters.
Disposable lighters are filled with fuel when the lighter is made, and cannot be refilled.