Gunpowder, also compressed gasses and compressed air.
Gun powder or air
gunpowder
Black powder is a mixture, not an element. It consists of potassium nitrate, charcoal and sulfur in the ratio 75:15:10. It is used in fireworks and was once used to propel bullets in guns(still used with some antique guns).
That's what they were designed for.
Old guns DID have bullets- that is the thing that is shot from the gun. They did not have cartridges, since they used loose gunpowder and bullets, and sparks created by flint on steel to ignite the powder.
Air is used to propel the plastic projectile
Depends on the caliber.
yes they are. machine guns are fed bullets. Gatling guns are hand cranked and have to be fed bullets at the same time. machine guns also spray bullets faster than Gatling guns.
air and gun powder are the most common.
Yes, guns shoot bullets
Gun powder is used in some small fireworks and it is also used in bullets for guns.
Yes, machine guns are much faster than Gatling guns. Gatling guns must be hand cranked and fed bullets at the same but machine guns does not have to be hand cranked. All they needs are bullets. Machine guns also fire more bullets faster than Gatling guns.