The U.S. dropped the atomic bomb on Hiroshima, Japan (code-named "Little Boy"), and the one on Nagasaki, Japan (code-named "Fat Man").

The atomic bomb (codenamed "Little Boy") is the gun structure, the bomb weighs about 4100 kilograms, about 71 centimeters in diameter, about 305 centimeters long. Nuclear charge for uranium-235, the explosive power of about 14,000 tons of TNT equivalent.

Atomic bomb (code-named "Fat Man"), the use of the implosion structure, with plutonium-239 as the nuclear charge. The bomb weighs about 4,500 kilograms, the thickest part of the bomb diameter of about 152 centimeters, the bomb length of about 320 centimeters, the explosive power is estimated to be 20,000 tons of TNT equivalent.

Atomic bomb (Atomic bomb) is one of the nuclear weapons, is the use of nuclear reaction of light and heat radiation, shock waves and sensory radioactivity caused by the killing and destruction of the role, as well as to cause large-scale radioactive contamination, to prevent the other side of the military action to achieve the strategic purpose of weapons of mass destruction.

Mainly includes fission weapons (the first generation of nuclear weapons, usually called atomic bombs) and fusion weapons (also known as hydrogen bombs, divided into two-stage and three-stage type). Some also put light elements with sensitized radiation inside the weapon to increase the intensity of radiation and expand contamination, or to enhance neutron radiation to kill and maim people (such as neutron bombs).

Nuclear weapons refers to the use of self-sustaining nuclear fission or fusion reaction release of energy, resulting in an explosion, and has the effect of mass destruction of weapons.

The main use of uranium 235 (厬U) or plutonium 239 (厱Pu) and other heavy nuclei of the fission chain reaction principle made of fission weapons, usually called atomic bombs; the main use of heavy hydrogen (dao H, deuterium) or super-heavy hydrogen (chuan H, tritium), and other light nuclei of thermonuclear weapons made of thermonuclear weapons or fusion weapons, usually called hydrogen bombs.

On October 16, 1964, China successfully exploded its first self-developed atomic bomb. According to declassified information, for the explosion of this atomic bomb, China I*** spent 2.8 billion yuan.

On June 17, 1967, China also successfully conducted its first hydrogen bomb test, breaking the nuclear monopoly and blackmail policy of the superpowers, and making great contributions to the Chinese people*** and the country.

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