- phenomenon where a system oscillation reaches maximum amplitude at specific driving frequency
- every physical system has one or more natural frequencies determined by its structure
- when driving frequency matches natural frequency, energy transfer is maximized
- mechanical resonance: tuning fork, bridge vibration, wine glass shattering at its resonant pitch
- electrical resonance: LC circuits tuned to select specific radio frequency bands
- orbital resonance: gravitational coupling locks planetary or satellite orbits into integer ratios
- chemical resonance: electron delocalization across multiple bonding structures (benzene ring)
- acoustic resonance: musical instruments amplify specific harmonics through resonant cavities
- social resonance: ideas, memes, and movements amplify when they match cultural receptivity
- resonance bridges physics, chemistry, biology, engineering, and social dynamics