How rockets work?

The motion of a [[KW]] rocket [[/KW]] is much like the motion of a balloon losing air. When the balloon is sealed, the air inside pushes on the entire interior surface of the balloon with equal force. If there is an opening in the balloon’s surface, the air pressure becomes unbalanced, and the escaping air becomes a backward movement balanced by the forward movement of the balloon.
rockets produce the force that moves them forward by burning their fuel inside a chamber in the rocket and then expelling the hot exhaust that results. Rockets carry their own fuel and the oxygen used for burning their fuel. In liquid-fueled rockets, the fuel and oxygen-bearing substance (called the oxidizer) are in separate compartments. The fuel is mixed with the oxygen and ignited inside a combustion chamber. The rocket, like the balloon, has an opening called a nozzle from which the exhaust gases exit. A rocket nozzle is a cup-shaped device that flares out smoothly like a funnel inside the end of the rocket. The nozzle directs the rocket exhaust and causes it to come out faster, increasing the thrust and efficiency of the rocket.
Some early scientists believed that rocket exhaust needed something to push against (such as the ground or the air) in order to move the rocket. Rockets traveling in the vacuum of space, however, demonstrated that this belief was not true. In fact, rockets produce more thrust in the vacuum of space than on Earth. Air pressure and friction with the air reduce a rocket’s thrust by about 10 percent on [[KW]] Earth [[/KW]] as compared to the rocket’s performance in space.