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> How come molecules "push" and "pull"? How come the strength varies?
The "push" and "pull" Warp is referring to (I guess) are the forces caused
by a pressure difference. This causes the next "bit" of air to be moved,
thus creating another pressure difference, and the next bit moved, etc, this
is how the wave propagates - it's the same as a longitudinal wave in a
slinky spring.
Of course at a molecular level "pressure" is caused by colliding molecules
etc, but I don't think you need to work at this level of detail to model how
sound waves propagate, you can just assume that each bit of air has a
pressure, and pressure differences will generate forces.
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