You get the same effect with the fine dust in feed mills. It is the same as a volatile gas. One spark and BOOM!
BTW, that foam is great for golf clubs. My new driver, several years ago, just didn't have the ooomph I expected. I recalled a magazine that said some brands of woods were filled with foam. Drilled a hole in the back of the driver and woods...filled with foam...epoxied the hole and the result was a great feel. However, my game still was lousy, sort of like Dorf.
Marriage is like a deck of cards. In the beginning, all you need is two hearts and a diamond. Later, you wish you had a club and a spade.