Re: [Phys-l] decibels

[trappe@physics.utexas.edu]

So the low pressure vacuum line is pressurized by the "tornadic"  
action, which results in a pressure decrease in the dirt chamber and  
would cool the house while cleaning if the dirt is quickly removed???

Gotta love those heat pump dual purpose vacuum cleaners...

Quoting chuck britton <cvbritton@mac.com>:

> But not what I would expect from a vacuum cleaner - in spite of what
> the ads might imply.
>
> At 12:53 PM -0700 8/29/11, Bernard Cleyet wrote:
> > On 2011, Aug 29, , at 12:30, chuck britton wrote:
> >
> > >  One possible way for a device to output more power than it takes in
> > >  would be for it to be extracting thermal E from its environment.  ;-)
> >
> >
> > Oh!
> >
> > bc thinks a coefficient of performance > 1.
> >
> > http://en.wikipedia.org/wiki/Thermal_efficiency
> >
> > bc
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