How to add kerosene to lighter?

Insert the sharp mouth of kerosene bottle into the hole upside down, and gently pinch the bottle with your fingers to refuel.

The fuel used in lighters is mainly combustible gas. Gasoline was widely used in the early days, but it is rarely used now because of its peculiar smell. Butane, propane and liquefied petroleum gas are widely used. They are pressurized and filled into a closed air box. Once released into the air, they absorb heat, vaporize and expand rapidly, and are easily ignited. Butane (CH3-CH2-CH2-CH3) used in lighters is n-butane, which is the general name of two alkanes and hydrocarbons with the same molecular formula (C4H 10). Include n-butane and isobutane (2- methylpropane). Butane is a flammable, colorless and liquefied gas.