Isn't the pressure rating of the cap relative to the outside ambient
pressure? You essentially have ambient pressure outside the face of cap
valve, plus the spring which provides the force to oppose internal
pressure difference up to the caps PSI rating.
--- arado7@sbcglobal.net wrote:
> Subject: Re: question for all you rocket scientists
>
>
> > Unless I just don't understand, with a radiator cap on the car the
> amount
> > of oxygen in the air would not matter to the temp in the radiator.
> The
> > boiling point would be higher depending on the rating of the cap
> and not
> > the outside air.
> >
> > Guide me if I'm wrong.
> >
> > Paul
> The cooling system of a car is not a rigid sealed system. There are
> rubber
> hoses and flexible sheet metal elements in radiator and heating coil.
>
> Therefore I believe atmospheric pressure would influence boiling
> point.
> Gary B9472283
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