Fusion joins two light nuclei into a heavier one
Definition
Nuclear fusion
The joining of two light nuclei to form a heavier nucleus, in which some mass is converted into the energy of radiation.
- Nuclear fusion is when two light nuclei join together to form a single heavier nucleus.
- It is the opposite of fission, which splits one heavy nucleus into smaller pieces.
Some of the mass is converted into the energy of radiation
- In fusion some of the mass of the original nuclei is converted into energy.
- This energy is released as radiation.
- Fusion needs extremely high temperatures and pressures, because the two positively charged nuclei repel each other and must be forced very close together.
Note
Fusion is the process that releases energy in the Sun and other stars.
Common Mistake
Do not mix up fusion and fission: fusion joins two light nuclei, while fission splits one heavy nucleus.
Self review
- What is nuclear fusion?
- What happens to some of the mass of the nuclei during fusion?
- In what form is the energy released during fusion?
- Why does fusion need very high temperatures and pressures?
- How is fusion different from fission?
