Daniel Bastos schrieb:
> Alright. But I guess my question is how do I distinguish, for example,
> a push from a pull. Should it all be just forces pushing one another? 

Strictly speaking, with pressure there's only "push", with "pull" being 
actually a push in the opposite direction:

(1) Pressure differential exerts a "pushing" force from high-pressure to 
low-pressure region

(2) Pushing force accelerates medium in the gradient zone, speeding it 
up until the pressure differential is compensated

(3) Inertia of the accelerated medium causes "overcompensation" of the 
pressure differential

(4) Pressure differential is now reversed -> back to (1), now with 
opposite direction


This is all that happens locally; at a larger scale, this will cause the 
pressure differential to propagate through the medium as a wave.

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