What is nuclear fission?

The fusion of two light nuclei to form a heavier nucleus The splitting of a heavy nucleus (like uranium-235) into two smaller nuclei plus neutrons and a large release of energy The emission of an alpha particle from a nucleus, reducing its mass by 4 The conversion of neutrons to protons in beta decay

What is a nuclear chain reaction?

A series of chemical reactions that produce radioactive waste products Each fission releases 2–3 neutrons that can trigger further fissions — if enough fissile material is present, this multiplies exponentially Neutrons circling around a nucleus, like a chain around a wheel The sequence of decay products from a single radioactive atom

What is 'critical mass' in the context of nuclear fission?

The mass of nuclear waste produced per megawatt of electricity The minimum mass of fissile material in which a self-sustaining chain reaction can occur — enough material that neutrons are more likely to hit another nucleus than escape The maximum mass of a nuclear reactor core The mass equivalent of one megaton of TNT expressed in kilograms

How does a nuclear power reactor use fission to generate electricity?

Fission directly converts radioactive particles into electrical current in a wire Controlled fission heats water, producing steam that drives a turbine connected to a generator Fission produces radioactive particles that strike solar panels to generate electricity Fission creates a magnetic field that induces a current without moving parts

What is nuclear fusion, and in what conditions does it occur?

The splitting of heavy nuclei at low temperatures using a laser The joining of two light nuclei (e.g. hydrogen isotopes) to form a heavier nucleus, releasing energy — requires temperatures of tens to hundreds of millions of degrees Celsius The merging of neutrons to form new elements without energy release The combination of chemical elements in a nuclear reactor

How does the Sun generate its energy?

The Sun burns hydrogen in a chemical combustion reaction with oxygen Nuclear fission — the Sun splits heavy atoms accumulated during its formation Nuclear fusion — hydrogen nuclei fuse in a chain of reactions to produce helium, with each step releasing energy as the mass of the products is slightly less than the reactants Gravitational collapse — the Sun's weight compresses its core, releasing potential energy as heat

Why does fusion release so much more energy per kilogram of fuel than fission or chemical combustion?

Fusion produces radioactive products that release additional energy over time Fusion converts a larger fraction of mass to energy (E = mc²) per nucleon than fission; both release millions of times more energy per kilogram than chemical reactions Fusion is actually less energy-dense than fission — it just uses cheaper fuel Fusion produces sound energy as well as heat — this additional output makes it more powerful

Why is controlled nuclear fusion for power generation so difficult to achieve?

We don't have enough hydrogen on Earth to fuel a fusion reactor Fusion requires radioactive plutonium which is too expensive to produce Achieving and maintaining plasma at 100 million °C while preventing it from touching any material container is an extraordinary engineering challenge Fusion produces too much radiation — we cannot shield a power plant adequately

What advantages would fusion power have over fission power, if achieved?

Fusion is easier to control, cheaper to build, and has been commercially proven Fusion produces radioactive products with longer half-lives, making them safer over time Fusion uses abundant fuel (hydrogen isotopes from water/lithium), produces no long-lived radioactive waste, and cannot sustain a runaway chain reaction Fusion produces electricity directly without needing turbines or generators

E = mc² explains why nuclear reactions release so much energy. What does this equation tell us?

Energy equals mass times the speed of light — the equation gives the speed of nuclear energy A tiny amount of mass (m) can be converted into an enormous amount of energy (E) because the speed of light squared (c² ≈ 9 × 10¹⁶ m²/s²) is an enormous conversion factor The equation shows that mass and energy are the same thing and can be used interchangeably in formulas E = mc² applies only to light — it does not apply to nuclear reactions