[GreenKeys] Re: teletype machine noise levels

[gil smith]

Hi guys:

Thanks for the input.  PSI and inches-mercury, I am familiar with -- 
pascals and bars not so much.  Any idea how an air-pressure level is 
related to a sound-pressure-level?  Seems like it should be a 
rate-of-change thing (eg: a fixed high air pressure is not making a sound).

Though I am in the audio field, I live on the circuit side, and not the 
acoustic side of things.

thanks,

gil

Sam (across the pond) Hallas wrote:
>A bar is unit of pressure equal to 10^5 Pascal. Usually seen on weather 
>charts as millibars. (eg 990 millibar = depression, 1030 millibar - 
>anti-cyclone).


Lyn (out on that dirt road) Kennedy wrote:
>1.0 bar is average air pressure at sea level, 29.92 inches of mercury, or
>14.7 psi.




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