I always have seen sound waves shown as sine waves in textbooks and basically every other context in which you learn about sound, but what’s the actual three dimensional shape it makes. Are they just compressional waves?
In: Physics
When you look at a [2D picture that represents a sound wave](https://www.researchgate.net/figure/1-Sound-wave-http-wwwmediacollegecom-audio-01-sound-waveshtml-This-image-is_fig2_329027353) it tries to represent several characteristics of the sound. For simplicity they often picture a (somewhat mythical or ideal) pure tone from a tuning fork.
They try to show . . .
Wavelength – The distance from one wave to the start of the next wave- λ
Frequency – how often the wave occurs in “cycles per second”
Amplitude – The height of the wave
Also important is the speed of propagation or velocity of the wave.
Where it gets tricky is that sounds can be described as different types of waves.
– Sound is a Mechanical Wave
– Sound is a Longitudinal Wave
– Sound is a Pressure Wave
Each of these ways of describing sound include different ways of trying to picture or portray sound.
Then it gets more complex when we realize that a simple “tuning fork” simple tone is seldom what we hear, and that the complex sounds that hit our ear drums (some we perceive and others are outside our range of hearing and sensitivity) make the question even more complex.
The best 3D visualization of sounds might be the behaviour of “non Newtonian fluids” on a speaker [like this](https://www.youtube.com/watch?v=3zoTKXXNQIU) or here in [slow motion](https://www.youtube.com/watch?v=sWu9CyDwuFs)
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