Methanol is very flammable and is sometimes used as an additive in gasoline.
The demonstrator pours just the right amount of methanol into the jug. The jug is twirled so that most of the liquid methanol is vaporized. Methanol has a higher vapor pressure pressure than water, so more liquid enters the gaseous phase than if water were poured into the jug at the same temperature. Video for Windows Quicktime Dropping a burning stick into the mouth of the jug produces an intense flame, almost an explosion. Molecules in the vapor phase are farther apart than in the liquid phase and present more surface area for reaction.