Re: Salt/Fresh water bouancy

["Alan D. Secor" <secor@btv.ibm.com>]

Because if the gauge is calibrated in feet sea water, then a pressure of 
14.7
psi would read 33 feet.  It would still read 33 feet in fresh water but 
the
actual depth that would correspond to 14.7 psi would be 34 feet due to 
the
difference in water density.  If the gauge is calibrated in pressure, then
14.7 = 14.7 psi regardless.  It's the depth to pressure correspondence
that changes with water density.

Al

> Jonathan Wallace wrote:
> > 
> > >You just might end up getting deeper than your sub is designed for.
> > 
> > Depth gauges are affected by the change in water density as
> > well.  So not only might your sub go deeper than it's designed
> > for, you're gauges might not tip you off until it's too late.
> 
> Why would density affect a pressure gauge?  A compressed air gauge works with water!
> 
> 
> 
> -- 
> Martin Sanderse
> ---------------
> "Problems worthy of attack
> prove their worth by hitting back"    Piet Hein
> ---------------
> The Ingenuity Group Inc.                 http://www.ingenuitygroup.com/~tigroup/
> Professionals harnessing quantitative methods for effective management decisions.
> 
> 

--
Alan D. Secor
e-mail: secor@btv.ibm.com