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Message Subject Confirmation – Tianjin was nuked
Poster Handle Anonymous Coward
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The critical mass of compressed fissile material decreases as the inverse square of the density achieved. Since critical mass decreases rapidly as density increases, the implosion technique can make do with substantially less nuclear material than the gun-assembly method. The "Fat Man" atomic bomb that destroyed Nagasaki in 1945 used 6.2 kilograms of plutonium and produced an explosive yield of 21-23 kilotons [a 1987 reassessment of the Japanese bombings placed the yield at 21 Kt]. Until January 1994, the Department of Energy (DOE) estimated that 8 kilograms would typically be needed to make a small nuclear weapon. Subsequently, however, DOE reduced the estimate of the amount of plutonium needed to 4 kilograms. Some US scientists believe that 1 kilogram of plutonium will suffice.



The supposed white ball in the video, if not caused by the shutter opening on the camera, also showed white ejecta being expelled, which was clearly seen, they appeared to be minerals, likely aluminium, magnesium, or some other alloy. Fission causes a release of energy. The energy released causes everything in its path to catch fire it does not spread combustible fuel.

I'm not sure how many pounds of material is expelled by those blasts but I can assure you it was far more than 16 pounds.



An ordinary "atomic" bomb of the kinds used in World War II uses the process of nuclear fission to release the binding energy in certain nuclei. The energy release is rapid and, because of the large amounts of energy locked in nuclei, violent. The principal materials used for fission weapons are U-235 and Pu-239, which are termed fissile because they can be split into two roughly equal-mass fragments when struck by a neutron of even low energies. When a large enough mass of either material is assembled, a self-sustaining chain reaction results after the first fission is produced.
 
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