内弹道是弹道的一部分，内弹道研究弹丸从点火到到离开发射器身管的行为。内弹道学研究对各种身管武器都有重要意义。

任何类型的身管武器第一步需要击发火药。最早的枪支、大炮由一个一端密封的金属管组成

Internal ballistics (also interior ballistics), a subfield of ballistics, is the study of the propulsion of a projectile.

In guns internal ballistics covers the time from the propellant's ignition until the projectile exits the gun barrel. The study of internal ballistics is important to designers and users of firearms of all types, from small-bore rifles and pistols, to high-tech artillery.