Inside a cracker there are two strips of card, attached end-to-end with a slight overlap. This overlap is treated with gunpowder – a mixture of potassium nitrate, charcoal and sulphur.
When the cracker is pulled, the friction generated between the two strips causes enough heat to set the gunpowder off. The tube amplifies the sound of the tiny explosion.
- How fast would Father Christmas have to fly to visit every child in the world?
- Is it more environmentally friendly to buy a fake Christmas tree, or a real one?
- If you ate your Christmas chocs too quickly and swallowed some foil, would you die?