Many may think it is by thrusting itself from the air with the help of gases ejecting out.The real flight of a rocket is different.A Russian revolutionary kibalchich explained the design of a rocket which is once used as a military weapon.In a tin cylinder closed at one end and open at other if we insert a cylinder of same size with gunpowder with a channel in center combustion begins at surface and spreads within a definite period of time to the outer surface . The gases presses on every side ,the pressure exerted on sides is offset,but the pressure at bottom is not offset by an opposite pressure as there is an outlet for gases. Thus we are able to thrust the rocket in direction in which it was mounted before ignition .
The same happens in a projectile also. Take the recoil of a rifle if our gun was in mid air and had nothing to rest upon it would move back after projectile is fired with a speed less than that of bullet.The oldest steam engine which was invented in 2nd century works on the same principle.
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