Bombing On Hiroshima
...explosion was equivelent to that realesed by the detonation of 20,000 tons of TNT. An atomic explosion causes an enourmous shockwave followed instantaneously by a rapid expansion of air called the “blast”. These are roughly half the energy released by an atomic explosion. In addition to its nearly unimaginable destructive force made up of pressure waves, flash burns, and high winds, a nuclear explosion also produces deadly radiation in the form of gamma rays. On June 18, 1945, President Truman gave preliminary approval to the invasion plans presented by General Marshall "Operation Downfall". On July 26, 1945 President Truman issued the Potsdam Declaration, which called for Japans unconditional surrender and listed peace terms. Truman had already heard of the successful detonation in New Mexico ten days prior. Truman’s military advisors told him dropping the bomb could prevent the deaths of 500,000 American soldiers. When Japan refused the Declaration, Truman authorized the drop of the atomic bomb on Hiroshima, a Japanese city located on the island of Honshu. At 2:45 A.M. the “Enola Gay” piloted by Brigadier General Paul W. Tibbets and his team of eleven men took off from a US pacific air base on Tinian Island with the atomic bomb code named “Little Boy” with a weight of four tons, fueled by uranium 235, and had the power of 12.5 kilotons of TNT. Six and a half hours later, at 8:15 A.M., the bomb was dropped, and exploded a minute at an altitude of 580 meters above central Hiroshima. A fire ball of 30 meters diameter formed in 0.1 milliseconds, with a temperature of 300,000 degrees centigrade. It expanded to its huge size in one second. The top of the atomic cloud reached an altitude of 17,000 meters. The maximum temperature at burst point was 3 million degrees centigrade. Burns melted away skin and burned through tissue and internal organs. People exposed within one kilometer of ground zero died immediately. Thermal burns on bare skin occurred as far as 3.5 kilometers from ground zero. The intense thermal heat emitted by the fire ball cause severe burns and loss of vision. Tile and glass melted, and all combustibles were consumed. The maximum wind velocity came out to be 440 meters per second. The maximum wind pressure was 35 tons per square inch, one survivor commented, “I’ve never been hit by a stampede of elephants, but I’m sure it can’t feel much different then that.” The wind collapsed all wooden houses within 2.3 kilometers from ground zero. Concrete buildings near ground zero collapsed in on them selves, doors and windows were blown off. Many people were trapped under buildings and burnt to death. The explosion destroyed everything with 4 square miles and killed 40,000 people automatically. ...