In article <4a80139b@news.povray.org>,
scott wrote:

>> 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.

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? 

But I guess when we talk about pressure, then a context in lower
pressure can be seen as pulling a context in higher pressure. Is that
the sort of pull that we're talking about?

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