Sound
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Sound is a phenomenon in which pressure disturbances propagate through an elastic material medium. In the context of physics, it is characterised as a mechanical wave of pressure or related quantities
A drum produces sound via a vibrating membrane
Pressure‑versus‑time waveform of a 20‑millisecond clarinet tone.
U.S. Navy F/A-18 approaching the speed of sound. The white halo is formed by condensed water droplets thought to result from a drop in air pressure around the aircraft (see Prandtl–Glauert singularity).
Mechanical wave
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In classical mechanics, a mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through an elastic material medium. Vacuum is, from classical perspective, a non-ma
Ripple in water is a surface wave.