Why does the wick of alcohol lamp fly out?

The wick of the alcohol lamp flies out because there is too little alcohol in the alcohol lamp, and a mixed gas of alcohol vapor and air is formed in the lamp body, reaching the explosion limit of alcohol vapor. When heated by an alcohol lamp, the mixed gas in the lamp will flow out and ignite when it meets the open flame on the wick, so that the mixed gas in the lamp will burn and spray out the wick.

Because alcohol lamps are macroporous containers, they can only explode, not explode.