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== Nuclear Fission vs. Nuclear Fusion ==
Nuclear fission and nuclear fusion are two distinct types of nuclear reactions that release large quantities of energy.<ref name="ref1" /> Fission is the process of splitting a heavy, unstable atomic nucleus into two smaller ones.<ref name="ref2" /> Conversely, nuclear fusion is the process where two light atomic nuclei combine to form a single heavier nucleus.<ref name="ref3" /> While both processes are used in energy production, their underlying principles, applications, and byproducts differ significantly.

=== Comparison Table ===
{| class="wikitable"
|-
! Category !! Nuclear Fission !! Nuclear Fusion
|-
| '''Process''' || Splitting a heavy nucleus into lighter nuclei.<ref name="ref2" /> || Combining two light nuclei to form a heavier nucleus.<ref name="ref2" />
|-
| '''Fuel''' || Typically heavy elements like uranium-235 and plutonium-239.<ref name="ref4" /><ref name="ref5" /> || Typically light elements like deuterium and tritium (isotopes of hydrogen).<ref name="ref2" /><ref name="ref3" />
|-
| '''Energy Release''' || Releases a large amount of energy, but less than fusion on a per-mass basis. || Releases several times more energy per kilogram of fuel than fission.
|-
| '''Natural Occurrence''' || Does not typically occur naturally, though some radioactive elements undergo spontaneous fission.<ref name="ref5" /> || Occurs in stars, including the Sun.<ref name="ref4" />
|-
| '''Byproducts''' || Produces long-lived radioactive waste. || Primarily produces helium, an inert gas, with some short-lived radioactive material like tritium being produced and consumed within the reactor.
|-
| '''Current Applications''' || Used in nuclear power plants for electricity generation and in nuclear weapons.<ref name="ref5" /> || Primarily experimental, with research focused on developing fusion reactors for power generation. It is also used in thermonuclear weapons.<ref name="ref2" />
|-
| '''Control''' || The chain reaction can be controlled and sustained in nuclear reactors.<ref name="ref4" /><ref name="ref2" /> || Reactions are difficult to sustain due to the extreme temperature and pressure required.<ref name="ref4" /><ref name="ref3" />
|}

[[File:Venn_diagram_Differences_between_Nuclear_Fission_versus_Nuclear_Fusion_comparison.png|thumb|center|800px|alt=Venn diagram for Differences between Nuclear Fission and Nuclear Fusion|Venn diagram comparing Differences between Nuclear Fission and Nuclear Fusion]]

=== Nuclear Fission ===
Fission reactions are initiated by bombarding a heavy nucleus, such as uranium-235, with a neutron. This causes the nucleus to become unstable and split into smaller nuclei, known as fission products, while also releasing additional neutrons and a significant amount of energy.<ref name="ref2" /> If these released neutrons strike other uranium-235 nuclei, they can trigger a self-sustaining chain reaction. This controlled chain reaction is the principle behind nuclear power reactors, which harness the heat produced to generate electricity.<ref name="ref4" /> Fission is a mature technology used for commercial power generation and has applications in medicine and research.<ref name="ref3" /> A primary concern with fission is the production of radioactive waste, some of which remains hazardous for thousands of years.

=== Nuclear Fusion ===
Fusion reactions involve the merging of light atomic nuclei, such as the hydrogen isotopes deuterium and tritium, under conditions of extreme temperature and pressure.<ref name="ref3" /> This process, which powers the sun and other stars, results in the formation of a heavier nucleus, like helium, and the release of a substantial amount of energy.<ref name="ref4" /> Fusion is considered a potentially cleaner and more sustainable energy source than fission because its fuel is abundant and it does not produce long-lived radioactive waste.<ref name="ref2" /> However, achieving and maintaining the necessary conditions for a sustained fusion reaction on Earth presents significant technological challenges. Research into controlled fusion is ongoing, with the goal of developing commercially viable fusion power plants in the future.<ref name="ref2" />

== References ==
<references>
<ref name="ref1">[https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Fundamentals_of_General_Organic_and_Biological_Chemistry_(LibreTexts)/11%3A_Nuclear_Chemistry/11.09%3A_Nuclear_Fission_and_Nuclear_Fusion "libretexts.org"]. Retrieved November 15, 2025.</ref>
<ref name="ref2">[https://www.orano.group/en/unpacking-nuclear/nuclear-fission-and-nuclear-fusion-what-you-should-know "orano.group"]. Retrieved November 15, 2025.</ref>
<ref name="ref3">[https://www.energy.gov/ne/articles/fission-and-fusion-what-difference "energy.gov"]. Retrieved November 15, 2025.</ref>
<ref name="ref4">[https://en.wikipedia.org/wiki/Nuclear_fission "wikipedia.org"]. Retrieved November 15, 2025.</ref>
<ref name="ref5">[https://www.twi-global.com/technical-knowledge/faqs/nuclear-fusion-vs-fission "twi-global.com"]. Retrieved November 15, 2025.</ref>
</references>

[[Category:Comparisons]]

Differences between Nuclear Fission and Nuclear Fusion - Revision history

Dwg: Article written and Venn diagram created.