Rocket &tungsten

     The history of rockets covers a span of eight centuries, but their use in aircraft armament began during World War II. Rockets answered the need for a large weapon that could be fired without recoil from an aircraft. Since the airborne rocket is usually launched at close range and measured in yards or meters, its accuracy as a propelled projectile is higher than a free-falling bomb dropped from high altitude.
    Rockets are propelled by the rearward expulsion of expanding gases from the nozzle of the motor. The necessary gas forces are produced by burning a mass of propellant at high pressure inside the motor tube. It is a common misconception that rockets are pushed forward by the reaction of hot gases against the surrounding air. However, rockets can function even in a vacuum. The propellant contains its own oxidizers to provide the necessary oxygen during burning.
    Rocket has similar relationship with tungsten, if you are interested in rocket and tungsten, please go to http://www.tungsten-alloy.com.