---
title: Physics
description: How the universe works: mechanics, electromagnetism, thermodynamics, and quantum theory.
category: sciences
url: /subcategory/sciences/physics
---

# Physics

How the universe works: mechanics, electromagnetism, thermodynamics, and quantum theory.

## Available Subjects

### Astrophysics & Cosmology

This discipline studies the physical properties of celestial bodies and the origin, evolution, and ultimate fate of the universe. Learners will understand stellar evolution, galactic dynamics, black holes, and the cosmic microwave background radiation.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 1 books, 2 websites

[Learn Astrophysics & Cosmology](/subject/astrophysics-and-cosmology)

### Biophysics

Biophysics applies physics to living systems. You will learn molecular motors and membranes, statistical physics of biomolecules, imaging techniques and the quantitative methods of modern biology.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 4 books, 1 courses

[Learn Biophysics](/subject/biophysics)

### Classical Mechanics

Classical mechanics is the study of the motion of macroscopic bodies under the influence of forces. You will understand Newtonian, Lagrangian, and Hamiltonian formulations, enabling you to model and solve the dynamics of particles, rigid bodies, and oscillating systems.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 4 courses, 1 websites

[Learn Classical Mechanics](/subject/classical-mechanics)

### Condensed Matter Physics

Condensed matter physics explains how large numbers of interacting particles produce the properties of solids and liquids. You will understand band structure, phonons, magnetism, superconductivity, and the many-body methods used to describe strongly correlated systems.

**Difficulty:** Advanced

**Resources:** 1 videos, 3 books, 1 websites

[Learn Condensed Matter Physics](/subject/condensed-matter)

### Electromagnetism

This branch of physics investigates the interactions between electrically charged particles and electromagnetic fields. Learners will master Maxwell's equations, electrostatic forces, magnetism, and the behavior of electromagnetic waves in various media.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 3 courses

[Learn Electromagnetism](/subject/electromagnetism)

### Modern Physics

This field examines twentieth-century developments that transformed our understanding of the universe, focusing on relativity and quantum mechanics. Learners will understand wave-particle duality, atomic structure, nuclear reactions, and the limitations of classical physics.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 1 courses, 1 websites

[Learn Modern Physics](/subject/modern-physics)

### Nuclear Energy & Fusion

Nuclear fission and fusion release energy from atomic nuclei. You will learn reactor physics, safety and waste, the fusion challenge and the technology and policy debates around nuclear power.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 1 books, 1 websites, 1 papers

[Learn Nuclear Energy & Fusion](/subject/nuclear-energy)

### Optics & Photonics

Optics and photonics study and engineer light. You will learn geometric and wave optics, lasers, fibre optics and imaging systems, and the technologies from lithography to LiDAR that depend on them.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 5 books, 1 courses, 1 websites

[Learn Optics & Photonics](/subject/optics-and-photonics)

### Particle Physics

This subfield of physics studies the fundamental constituents of matter and radiation, and the interactions between them. Learners will understand the Standard Model, quarks, leptons, gauge bosons, and how particle accelerators probe subatomic forces.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 1 books, 2 courses, 4 websites

[Learn Particle Physics](/subject/particle-physics)

### Physics

Physics is the fundamental science of matter, energy, space, and time. Learners will understand the core principles governing the universe, including mechanics, electromagnetism, thermodynamics, and quantum behavior, enabling them to solve complex physical problems.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 3 books, 1 courses, 5 websites

[Learn Physics](/subject/physics)

### Plasma Physics

Plasma physics studies ionized gases and the collective behaviour of charged particles in electric and magnetic fields. You will understand plasma confinement, waves and instabilities, and the diagnostics used in fusion energy research and astrophysical plasmas.

**Difficulty:** Intermediate, Advanced

**Resources:** 2 books, 5 courses

[Learn Plasma Physics](/subject/plasma-physics)

### Quantum Mechanics

Quantum mechanics is the study of physical phenomena at the atomic and subatomic scales. Learners will understand wave-particle duality, the Schrödinger equation, quantum states, and how to calculate probabilities for physical observables.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 3 books, 7 courses

[Learn Quantum Mechanics](/subject/quantum-mechanics)

### Quantum Physics

This discipline explores the behavior of matter and energy at the atomic and subatomic scales. Learners will understand wave functions, the Schrödinger equation, quantum superposition, entanglement, and how these principles apply to modern technology.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 1 books, 2 courses, 2 websites

[Learn Quantum Physics](/subject/quantum-physics)

### Relativity

This area of physics covers Albert Einstein's theories of special and general relativity. Learners will understand how gravity bends spacetime, the relationship between mass and energy, time dilation, and the dynamics of black holes and gravitational waves.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 1 books, 3 courses, 1 websites

[Learn Relativity](/subject/relativity)

### Statistical Mechanics

Statistical mechanics applies probability theory to large assemblies of microscopic particles. Learners will understand how macroscopic thermodynamic properties, like temperature and entropy, emerge from the microscopic states of individual atoms and molecules.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 3 books, 4 courses, 1 websites

[Learn Statistical Mechanics](/subject/statistical-mechanics)

### Thermodynamics

Thermodynamics explores the relationships between heat, work, entropy, and energy. Students analyze phase equilibria, chemical reactions, and power cycles, gaining the ability to predict system behavior and calculate the efficiency of energy conversion systems.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 6 books, 3 courses

[Learn Thermodynamics](/subject/thermodynamics)

### Waves & Optics

This subject investigates the propagation of wave energy and the behavior of light. Learners will understand wave interference, diffraction, polarization, and the principles of geometric and physical optics used to design lenses and optical instruments.

**Difficulty:** Beginner, Intermediate, Advanced

**Resources:** 1 videos, 1 books, 3 courses

[Learn Waves & Optics](/subject/waves-and-optics)

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