Classification by Subdiscipline

Some of the primary physics subdisciplines are

5<2 $\bullet$5<3 $\circ$5<4 $\Box$5<5 $\Diamond$5<6 $\sqrt{}$5<7 $\Rightarrow$$\bullet$

• Acoustics
• Astrophysics
• Atmospheric and space physics
• Atomic and molecular physics
• Biophysics
• Condensed matter physics
• Cryogenics
• Electrodynamics
• Fluid mechanics and aerodynamics
• General Relativity and Other Gravity Theory
• Geophysics
• Medical physics
• Nuclear physics
• Optics and quantum optics
• Particle physics (aka High Energy Physics)
• Plasma physics
• Quantum field theory
• Thermodynamics and Statistical mechanics

The Big 6
Physics Disciplines

• Acoustics (Sound and Hearing)
• Electricity & Magnetism
• Mechanics
• Nuclear & Modern Physics (Quantum, Nuclear, Astro, Relativity & Condensed Matter)
• Optics (Light and Vision)
• Thermodynamics.

What is Modern Physics?

• Modern Physics refers to Physics knowledge obtained in the first half of the $20^{th}$ century.
• Often is used to represent the subjects of Quantum Mechanics and Relativity.