The Atomic Bomb :: American America History

The Atomic Bomb The atomic bomb is a powerful, explosive nuclear weapon. It is fueled by the fission of the nuclei of specific amounts of plutonium or uranium, in a chain reaction. The strength of the explosion created by one of these bombs is equal to the strength of an explosion created by thousands of tons of TNT. To detonate one of these bombs, enough mass of plutonium or uranium must be provided to reach what is known as "critical mass." Critical mass is the mass at which the nuclear reactions going on inside the material can make up for the neutrons that are leaving the material through its outside surface. These materials are usually separated within the bomb so that critical mass cannot be reached until the bomb is ready to explode. Once the chemical reactions within the bomb begin, the neutrons released by each reaction hit other atoms and create more fission reactions until all the material is scattered, or completely exhausted. This process releases enormous amounts of energy in the form of extreme heat and a massive shock wave. These nuclear explosions, in addition to their pressure waves, high winds, and flash burns, produce deadly radiation that contaminates soil and water, and destroyed living matter. The atomic bomb was first created in the early twentieth century. Physicists in the United States and Europe had discovered that the fission of uranium could be used to create a deadly explosive weapon. A letter was sent to U.S. president Franklin D. Roosevelt by Albert Einstein that described this discovery and warned him of its potential dangers if developed by other nations. The Manhattan Project was established by the U.S. government in 1942 so the country could develop an atomic device. A team under the command of United States Army Brigadier General Leslie R. Groves designed and built the first atomic bombs, directed by J. Robert Oppenheimer. This type of bomb was first tested at Alamogordo, New Mexico, on July 16, 1945. The amount of energy that was released by this explosion alone was equivalent to twenty thousand tons of TNT. Many nations have tested nuclear devices, in the atmosphere, under the earth, and under the oceans. Only the United States of America, Russia, Great Britain, France, and China openly admit to possessing these nuclear weapons. Many other nations, however, are thought to have the capability to assemble these items quickly.