Jesse Holleran - Whoosh Bottle
The bottle begins full of air and oxygen. After I put alcohol in the bottle it becomes volatile and evaporates rapidly. The liquid alcohol becomes alcohol vapor as I swirl it around the bottle. As it evaporates, a mix of air / oxygen and alcohol is left inside the bottle. By adding a flame in the form of a match, we are adding heat energy. This causes a combustible chemical reaction to occur between the oxygen and another alcohol vapor. The result is an exothermic reaction (a reaction in which heat is released). When you hear the sound of the "Whoosh" most of the oxygen has been used up and a jet of flame shoots up from the bottleneck. After which you may see a flame dance around inside the bottle and pulse for a few seconds. This happens due to left over alcohol remaining in the bottle. However most the oxygen has been used up, so fresh oxygen is sucked down into the bottle from outside which re-ignites the alcohol vapor again. After the experiment you will notice the bottle has liquid in the bottom. This is carbon dioxide and water, which is produced as a by-product of the reaction.