Re: [Phys-L] weather, school, and cars

[brian whatcott <betwys1@sbcglobal.net>]

On 1/27/2014 9:10 PM, Anthony Lapinski wrote:
> I've been talking with a friend in Chicago, and he's mentioned about
> schools being closed due to the very cold weather there. I asked
> specifically the reasons for the closings, and he could not really tell
> me. I also searched online for some explanations. Does anyone know? Too
> expensive to heat the buildings? Health risk for kids waiting outside for
> buses? Buses malfunctioning?
>
> He also mentioned that many stores are out of HEET. As I understand it,
> HEET is a sort of gasoline antifreeze that contains alcohol which prevents
> the carburetor from icing. Is this additive really necessary since
> gasoline, depending on the type, generally freezes at a very low
> temperature (-72 °C)? And does this depend on how full the gas tank is?
>
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Road transport is a leading cause of injury and death. The accident rate 
rises in severe weather.      The maker of HEET claims that methanol is 
more effective at collecting water than ethanol and can reduce the 
incidence of ice particles. High pressure fuel systems in current use 
use smaller passages through regulators and injectors and are more 
sensitive to particulate contamination, so that two fuel line filters 
(along with mesh screens at the tank pump) are now standard fittings. 
HEET claims to provide solvents which reduce system fouling.

Brian Whatcott    Altus OK

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