In physics, Nuclear fusion is the process by which two atomic nuclei join together to form a heavier atom.
The new core has a mass less than the mass of the two nuclei have merged to form it. This difference in mass is released as energy. The energy released varies depending on the nuclei that bind and the reaction product. The amount of energy released corresponds to the formula E = mc2 where m is the mass difference observed in the system between before and after the merger.
Infografia courtesy of EROSKI CONSUMER.es
atomic nuclei tend to repel each other because they are positively charged. This makes the merger can only occur in conditions of very high temperature or pressure to compensate the repulsive force. The elevated temperature increases the thermal motion of the nuclei and this may lead to merge by tunneling. For this to happen are required temperatures of millions of degrees. The same effect can occur if the pressure on the nuclei is very large, forcing to be very close.
The easiest fusion reaction to achieve (ie, requiring less energy) is the deuterium and tritium two isotopes of hydrogen to form helium.
Source and complete on paper and videos science.portalhispanos.com
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