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At 04:06 PM 4/9/99 -0400, Art Greenberg wrote:

>I wonder if the change is due to gas temperature. Does anyone know how the
>gas temperature affects oxygen sensors? Intuition tells me that higher gas
>temperature would cause a high FO2 reading, but if the effects described
>here are to be attributed to gas temperature, the opposite would have to
>be true.

I think it's due to the viscosity of the gas.  If you're
topping-off the fill slowly (which is usually the case
toward the end of the fill) the gas you're pouring into
the tank is over 43% as thick as water is (see my previous
post for where this number came from).

Imagine a tank full of water and very slowly pouring
dyed water on top.  It wouldn't mix very quickly on
it's own.

-Mike Rodriguez
<mikey@ma*.co*>

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