Research topics below this in the hierarchy
- Descriptive and experimental mechanics
- Acoustics. Sound
- Heat
- Optics. Light
- Radiation physics (General)
- Electricity and magnetism
- Nuclear and particle physics. Atomic energy. Radioactivity
- Geophysics. Cosmic physics
- Geomagnetism
- Atomic physics. Constitution and properties of matter. Including molecular physics, relativity, quantum theory, and solid state physics
- Meteorology. Climatology, including the earth's atmosphere