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====OCR====
:[https://www.amazon.co.uk/gp/product/0198359837/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359837&linkCode=as2&tag=nrjc-21&linkId=3c4229e8b023b2b60768e7ea2307cc6f ''Nuclear fission, pages 184-185, Gateway GCSE Physics, Oxford, OCR '']
==Key Stage 5==
===Meaning===
[[Fission]] is the splitting of a heavy [[Atomic Nucleus|nucleus]] into two approximately equal fragments, releasing [[energy]].
===About Fission===
[[Nuclear fission]] can be spontaneous or [[Electromagnetic Induction|induced]] by the absorption of a [[neutron]].
When [[uranium-235]] ]] or [[plutonium-239]] absorbs a [[neutron]], it becomes unstable and splits into two smaller [[Atomic Nucleus|nuclei]] along with additional [[neutron]]s and a large amount of [[energy]].
The released [[neutron]]s can induce further [[Nuclear Fission|fission]] reactions, leading to a chain reaction.
Fission releases a significant amount of [[energy]], primarily in the form of kinetic [[energy]] of the [[Nuclear Fission|fission]] fragments.
Fission is used in [[nuclear reactors]] to generate [[electricity]] and in [[nuclear weapons]].