IP: Back to the books! (was second this motion)

[David Farber <farber () cis upenn edu>]

> Date: Fri, 8 Oct 1999 08:31:38 -0700
> To: farber () cis upenn edu
> From: Ari Ollikainen <Ari () OLTECO com>
>
>
> > > Date: Fri, 8 Oct 1999 10:57:35 -0400 (EDT)
> > > From: Kenneth Hoffman <a025300t () bc seflin org>
> > > Subject: Re: IP: Pseudo science at work. Where is the Exon station 
> > > from telecom digest
> > > To: David Farber <farber () cis upenn edu>
> > >
> > > Prof. Farber
> > >
> > > If the gas companies are so concerned at the "possible" risk from personal
> > > communication devices.  Why don't they force the car companies to install
> > > devices to prevent an overflow during fill-up.
> > >
> > >
> > > With the flash point of gasoline at 70deg. F, I would be more concerned
> > > that a spark or explosion would occur from gas coming into contact with a
> > > hot exhaust system.
> > >
> > > Kenneth R. Hoffman, II
> > > Email:  mailto:a025300t () bc seflin org
>
>
>       Flash point, on the whole, doesn't mean a lot in this latest
>       Luddite fear...HOWEVER, it's at least instructive to examine
>       the mechanism involved:
>
>       Flashpoint is the lowest temperature at which a material gives off
>       enough flammable vapor to produce a momentary flash when exposed to a
>       small flame. (note that the "flame" in question has to be co-located
>       with the flammable vapor). The flash point of gasoline is -43 deg. C
>       (-45 deg. F), which is the reason it is considered highly flammable.
>
>       There is a minimum ratio of hydrocarbon vapor to air, below which
>       ignition will not occur. Alternately, there is also a maximum ratio
>       of hydrocarbon vapor to air, at which ignition will not occur. These
>       limits are termed the lower and upper explosive limits. For gasoline
>       vapor, the explosive range is from 1.3 to 6.0% vapor to air.
>
>       If you think the requisite explosive vapor ratio exists in the
>       average automotive refueling situation...then be fearful, be very
>       fearful when you turn the ignition key to start your car.
>
>       Spilling raw fuel on the ground and making a cell phone call
>       won't blow you up...really!
>
>
>       OLTECO                    Ari Ollikainen
>       P.O. BOX 3688             Networking Architecture and Technology
>       Stanford, CA              Ari () OLTECO com
>       94309-3688                415.517.3519