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Reference.org
Internal ballistics
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<p>Internal ballistics (also interior ballistics), a subfield of <a href="/facts/Ballistics/3WHTox0u">ballistics</a>, is the study of the <a href="/facts/Propulsion/xTuW8Fw2">propulsion</a> of a <a href="/facts/Projectile/kaDpG3N7">projectile</a>. </p><p>In <a href="/facts/Gun/SHApdBYr">guns</a>, internal ballistics covers the time from the <a href="/facts/Propellant/K88ymXRy">propellant</a>'s ignition until the projectile exits the <a href="/facts/Gun_barrel/bPyBmQek">gun barrel</a>. The study of internal ballistics is important to <a href="/facts/Designer/Jy3q7cap">designers</a> and users of firearms of all types, from small-bore <a href="/facts/Rifle/H3mJx7U4">rifles</a> and <a href="/facts/Pistol/pQgRhGBM">pistols</a>, to <a href="/facts/Artillery/GLpMYG9o">artillery</a>. </p><p>For <a href="/facts/Rocket/b6j4keIl">rocket</a>-propelled projectiles, internal ballistics covers the period during which a <a href="/facts/Rocket_motor/XT5gaFAb">rocket motor</a> is providing thrust. </p>