↩ 🔵 🔵 🔵 ❪✺❫ Physical Concepts ○ ❪✺₁₀❫ Class Portals ○ ❪✺₁❫ Astronomical Classes ○ ❪✺₁❫ Electromagnetic Classes ○ ❪✺₁❫ Mechanical Classes ○ ❪✺₁❫ Temporal Classes ○ Atom ○꠹ Cycle ○꠹ Fluid ○꠹ Particle ○꠹ Physical Field ○꠹ Physical Object ○꠹ Physical Quantity ○꠹ Redshift ○꠹ Wave ○꠹