There is a kind of firecrackers that fly into the sky and then explode. What is the principle of this kind of firecrackers flying into the sky?
Kick two feet, a kind of firecrackers. Gunpowder is ordinary gunpowder, tighter and thicker, but there is not much gunpowder. Firecrackers are divided into two chambers, the middle of which is connected by a lead wire, and the lower part explodes first, so that the soil at the bottom is washed away, and the reaction force makes firecrackers fly into the sky, and at the same time, the upper chamber is ignited and exploded.