Re: [Phys-l] question about Bernoulli

[William Robertson <wrobert9@ix.netcom.com>]

Yes, that is essentially the original question. Thank you.  
Complicating the original question is the fact that I apparently chose  
a phenomenon where Bernoulli doesn't apply.

Bill


William C. Robertson, Ph.D.


On Nov 23, 2010, at 8:27 AM, LaMontagne, Bob wrote:

> Let me take a stab at the original question - as far as I can  
> remember it. As usual, the thread evolved into something different -  
> probably because no one had a good response to the question.
>
> Pressure comes from the momentum change of the molecules of a gas  
> when they hit the walls of a container. The question was "what is  
> happening at the molecular level to explain the reduction in  
> pressure as a gas flows from a large diameter pipe into a smaller  
> one?". Specifically, I think the question was asking about the  
> component of velocity of the molecules perpendicular to the pipe  
> walls - was it reduced? - and by what mechanism was it reduced?
>
> Bob at PC