Firecrackers are rolled paper tubes filled with black powder (also called gunpowder). They might also be filled with flash paper and a fuse. When you light the fuse of a firecracker, the fire burns along the fuse. Eventually, it reaches the powder.

How are fireworks made and what chemicals are used?

Traditionally, gunpowder used in fireworks was made of 75 percent potassium nitrate (also called saltpeter) mixed with 15 percent charcoal and 10 percent sulfur; modern fireworks sometimes use other mixtures (such as sulfurless powder with extra potassium nitrate) or other chemicals instead.

How are fireworks made scientifically?

Fireworks are a combination of science and innovation. They use high energy chemical reactions to put on a light show for all of us to enjoy. They work by mixing together a series of high energy compounds. These compounds create explosions.