When the gunpowder was ignited, rapidly expanding gases were propelled from the open end of the tube, hurling the projectile into the sky. ( This fundamental principle is used today to send astronauts into space.)
उसके ऊपरी सिरे में, बारूद के छोटे कण भरकर उसे बंद किया जाता था और निचले हिस्से में बड़े कण भरे जाते थे ।