Re: Unit conversion (low Audi cont)

["Graydon D. Stuckey" <graydon@apollo.gmi.edu>]

On Mon, 14 Oct 1996, Brendan Rudack wrote:

> On Mon, 14 Oct 1996, Fringe Ryder wrote:
> > I'm not sure what an Nm is - Nautical Miles are about 1.85 km.  Nanometres
> > are tiny - don't know why you'd want to cover them here.  They are used in
> > the U.S. directly though for physics work.  
> 
> That would be Nm as in (N)(m), Newton x Meters.  Or
> (Kg)(m^2)/(second^2).

A HA!  Brendan, He got you!  You took him seriously!  You have to get 
your head out of the books once in awhile.  :-)

> > What's the metric equivalent of a decibel?
> 
> Sound intensity is measured in (Watts)/(meters^2) and in decibels.
> The scale for sound intensity is logarithmic and is expressed by the
> equation:  B(Beta)(in dB)=10logI/Io
> I=intensity
> Io=intensity of some reference level

Thanks, I have been wondering that myself since I started working in the 
noise business.  :-)

> A question of my own.  WHen converting mmHg to inHg is it simply
> converting mm to inches?

Yes, but why is Mercury "Hg," when neither of these two letters can be 
found in the name "Mercury?"   :-)

Sincerely,
Confused in Flint.