Bullet
The bullet is pushed out of the gun by hot gases at a high pressure. The gunpowder burns very fast. It makes hot gases. The hot gases are at a high pressure. The high pressure pushes the bullet out of the gun barrel at a high speed. Bullets have many uses. They are used as a weapon in war. They are used by police. They are used for self-defense. They are used for hunting animals for food or as a sport. They are used for shooting targets.