Cloud in a Bottle – A really visual way of creating a water vapor cloud instantly in a 2-liter bottle. Dust Explosion - Nothing happens when you try to ignite a pile of lycopodium on the table. By itself, the powder is not flammable. When the fine powder is dispersed in the air and each particle is surrounded by oxygen, it’s very flammable…and the fire ball is huge. Liquid Nitrogen Explosion - Steve wrapped up the studio portion of the segment talking about the expansive nature of liquid nitrogen which boils at room temperature.