What is the principle of nuclear fission

What is the principle of atomic fission? Be specific, thank youHello, chemical change. According to the chemical definition, as long as a new substance is formed, it is a chemical changeNuclear fission is the change in which a nucleus splits into several nuclei. Only some atomic nuclei with very large mass, such as uranium (y ó u), thorium (t ǔ) Nuclear fission can occur only after waiting. After absorbing a neutron, the atomic nuclei of these atoms will split into two or more atomic nuclei with less mass, and release two to three neutrons and a lot of energy at the same time, which can also make other atomic nuclei undergo nuclear fission... so that the process can continue. This process is called chain reaction. When nuclear fission occurs, the atomic nucleus releases huge energy, which is called atomic nuclear energy, commonly known as atomic energy. The energy released after the complete nuclear fission of 1 gram of uranium 235 is equivalent to the energy generated by burning 2.5 tons of coal. All atomic nuclei have a certain binding energy. The average binding energy is the binding energy divided by the number of nucleons. Under the action of the outside world, the nucleus (parent nucleus) is destroyed in some of its internal interactions between nucleons, which makes the nucleus split into two lighter nuclei (there are also three or four splits,What is the basic principle of fission nuclear weapons?The basic principle of fission nuclear weapons is to make a certain amount of uranium-235 or plutonium-239 change from a subcritical state to a supercritical state, that is, to make the nuclear device produce neutrons faster than the neutrons escape from the nuclear device. There are two ways to achieve this transformation: one is to divide the nuclear device into two parts, each of which is too small to have a positive neutron multiplication rate, and then use gun type equipment to break the two parts into one piece; Another method is to wrap the spherical nuclear device in the subcritical state with high chemical explosives, and press the nuclear device into the supercritical state by detonation.Principle of nuclear fissionA neutron acts as a cannonball to bombard a heavy nuclear atom, and the heavy nuclear atom releases a neutron to bombard the next heavy nuclear atom and generate huge energy to form a chain reactionThe principle of nuclear fission?What is the principle of nuclear fissionThe principle of nuclear fission?What is the principle of nuclear fissionWhat is the principle of nuclear fission?Nuclear fission starts with the acceleration of neutrons by the initial neutron accelerator. The accelerated neutrons bombard other atomic nuclei (at present, only two materials, uranium and plutonium, are most easily exploded). Other atomic nuclei are exploded, and more neutrons are generated. These neutrons bombard other atomic nuclei, thus nuclear fission is generated. This produces extremely high temperatures. Humans use these temperatures to generate electricity.Nuclear fission is a chain reaction. If it is not controlled, it will become larger and larger, and the energy will accumulate uncontrollably. Therefore, people will insert a carbon rod into the nuclear fission reactor, so that the size of the nuclear fission reaction can be controlled.