Fission and Fusion: Definition, Differences, Examples and Applications

Have you ever wondered how the Sun produces its energy or how nuclear power plants generate electricity? The answer lies in two important nuclear processes: fission and fusion. Although both reactions release tremendous amounts of energy, they occur in completely different ways. These processes play a vital role in energy production, medicine, space science and modern technology. This article covers the difference between nuclear fission and nuclear fusion, along with processes, examples, and real-life applications.

Table of Contents 

• What is the Mendeleev Periodic Table
• Mendeleev's Periodic Law
• Frequently Asked Questions on Fission and Fusion

What is Fission and Fusion

Nuclear fission is a reaction in which a large and heavy atomic nucleus splits into two or more smaller nuclei. What happens is that during this process, a huge amount of energy is released along with neutrons and radiation. 

Fission usually occurs when a heavy atom, such as uranium-235, absorbs a neutron. The nucleus becomes unstable and breaks apart into smaller atoms, releasing energy.

Fission Chain Reaction

In fission, neutrons released from one reaction collide with other atoms, causing them to split. This can lead to a rapidly increasing number of reactions.

Example of Fission Reaction:

Uranium-235 + Neutron → Barium + Krypton + Neutrons + Energy

The released neutrons can strike other uranium atoms, causing them to split as well. This leads to a chain reaction, where many fission reactions occur in a short period of time.

But what are the Uses of Nuclear Fission?

Nuclear fission has several important applications:

1. Nuclear power plant working involvesFission reactions, which are widely used to generate electricity in nuclear reactors.
2. Nuclear Weapons like Atomic bombs, operate using uncontrolled nuclear fission reactions.
3. Scientific Research involves the Fission reactions, which help scientists study atomic behaviour and nuclear energy.

On the other hand,Nuclear fusionis a reaction in which two or more light atomic nuclei combine to form a heavier nucleus. During this process, an enormous amount of energy is released.

Importantly, Fusion reactions require extremelyhigh temperatures and high pressure to overcome the repulsive forces between positively charged nuclei.

Example of Fusion Reaction

Deuterium + Tritium → Helium + Neutron + Energy

Here, isotopes of hydrogen combine to form helium and release large amounts of energy.

Where Does Fusion Occur?

Fusion reactions occur naturally in stars, including the Sun. The immense heat and pressure inside stars allow hydrogen atoms to fuse and produce energy, which is released as light and heat.

Although fusion is difficult to control on Earth, scientists are researching ways to use it for energy.

1. Fusion power plants are being developed as a potential future energy source.
2. Hydrogen Bombs; Fusion reactions are used in thermonuclear weapons.
3. Energy in Stars; Fusion is the process that powers the Sun and other stars.

Although both reactions release nuclear energy, they occur in opposite ways and cause different effects of radioactive pollution.

Read More: Heat Transfer and Its Types and Heat of Combustion

Difference Between Fission and Fusion

Nuclear Fission	Nuclear Fusion
Involves the splitting of a heavy nucleus into smaller nuclei.	Involves the combination of lighter nuclei to form a heavier nucleus.
Occurs mainly in unstable heavy elements like uranium.	Occurs in light elements such as hydrogen isotopes.
Produces many radioactive particles.	Produces relatively fewer radioactive by-products.
Requires neutrons to initiate the reaction.	Requires extremely high temperature and pressure.
Used in nuclear reactors to generate electricity.	Occurs naturally in stars like the Sun.
The energy released is very large compared to chemical reactions.	The energy released is about 3-4 times greater than that of fission.

Read More: Fuel Types 

As we have learned, the difference between fission and fusion are two powerful reactions that release enormous energy from the atomic nucleus. While fission splits heavy atoms into smaller ones, fusion combines light atoms to form heavier atoms. Both reactions play a major role in science, energy production, and the study of the universe.