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The difference between Fusion and Fission is that Fission is easier to do and produces more energy than fusion reactions. However fission can be dangerous and is used in Nuclear reactors. Fusion however is safer and produces less energy but safely. It is quite difficult to cause a Fusion reaction however.
Fusion would be much safer because it does not produce the very dangerous fission products that fission power does. However for the present time there is no way of using fusion power, it is just a possibility for the distant future.
We don't know much about fusion as it is still very experimental. It will not produce the dangerous fission products that fission does, but it may have other dangers unknown as yet. Nuclear fusion has more destructive potential than fission. Fusion is the principle powering the H-bomb developed in the Cold War. Just to put the power of a Fusion bomb in perspective, it is detonated by a fission bomb half the size of the one dropped on Japan. THAT'S JUST THE DETONATOR.
Fission and fusion are different nuclear reactions.
No, fission and fusion are not opposites. Fission is defined as the act of splitting into parts and fusion is defined as a coalition of factions or the act of fusing.
fission..sup
Fission.
Fission
For fusion, the main disadvantage is that nobody has been able to make it work. However it does have promise and if it can be developed it will not produce the dangerous fission products that fission does. For fission, see reply to question 'What are the disadvantages of nuclear fission power'
Energy is released during fusion and fission.
Fusion is harder to control/contain than fission. The Sun is fusion energy and we are 150 000 000 kilometers away, it is still dangerous to be exposed to that radiation for many consecutive hours. Inside the Earth, and many rocks, have ongoing fission and it is no trouble to live on the surface of this planet.
Definition: energy from nuclear fission or fusion: the energy released by nuclear fission or fusion