Fusion
* Combining light nuclei: Fusion reactions involve the combining of two or more light atomic nuclei, typically isotopes of hydrogen (deuterium and tritium), to form a heavier nucleus.
* Mass defect and energy release: In fusion, the total mass of the product nucleus is slightly less than the combined mass of the original nuclei. This difference in mass, known as the "mass defect," is converted into a tremendous amount of energy according to Einstein's famous equation E=mc².
* Example: In the fusion of deuterium and tritium, the mass defect results in the release of a neutron and a large amount of energy.
Fission
* Splitting heavy nuclei: Fission reactions involve the splitting of a heavy atomic nucleus, such as uranium-235, into two or more lighter nuclei.
* Mass defect and energy release: Similar to fusion, fission also results in a mass defect, where the total mass of the fission products is slightly less than the mass of the original nucleus. This mass defect is converted into energy.
* Example: When uranium-235 absorbs a neutron, it can undergo fission, releasing energy, fission products (like barium and krypton), and additional neutrons.
Key Differences in Mass:
* Fusion: The final nucleus in a fusion reaction has *less* mass than the original nuclei combined.
* Fission: The fission products have *less* mass than the original nucleus.
In summary:
Both fusion and fission reactions involve a loss of mass, which is converted into energy. However, the starting materials and the resulting products are significantly different. Fusion combines lighter nuclei to form heavier ones, while fission splits heavier nuclei into lighter ones.
