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.
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
Mechanical wave
…of the longitudinal wave is increased in higher index of refraction, due to the closer proximity of the atoms in the medium that is being compressed. Sound is an example of a longitudinal wave. This type of wave travels along the surface or interface between two media. An example of a surface wave would…
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).