OOPPPPS!!!!
I suppose the best I can say about this is that the water film would be thicker, form sooner,
and the temperature/humidity combination is closer to real world conditions.
I have been taught that the film thickness at which the water begins to act chemically the
same as bulk water is 5 molecules. As the temperature increases it requires higher levels of
humidity to reach this thickness with all other things being equal.
David A. Douthit
Manager
LoCan LLC
[log in to unmask] wrote:
> David Douthit exclaims:
>
> First; trying to grow dendrites in a 85/85 environment is difficult at
> best. Dendrites
> require liquid water. the free energy at 85 degrees C is to high. It will
> not allow a liquid
> water film to form. you must be below 40 degrees C to ensure the formation
> of liquid water.
>
> Doug Pauls, well into his second Mt. Dew of the day, responds:
> No it doesn't, no it doesn't, no it's not, yes it will, and no you don't,
> respectively.
>
> It is not hard to grow dendrites, I do it frequently. Anyone who does SIR
> testing will say the same. I've even grown dendrites on gold samples.
> Dendritic growth takes moisture, bias and an ionic contaminant. The
> greater the magnitude of these factors, the greater the propensity for
> dendritic growth. Yes, most dendritic growth requires liquid water, but
> you only need a few molecular thicknesses to do this, which is easily
> attained at 85/85. Yes, liquid water can form at 85/85. All you need is a
> 1-2 degree difference in temperature between the environment and your
> substrate and poof, water. When water forms, temperature wise, depends on
> the relative humidity and the temperature. SIR testers, if they have done
> it long enough, have had an occasion where power goes out on the chamber
> and the temperature drop while the humidity remains high. You rapidly
> reach the dew point well above 40C.
>
> I'm sure Brother Ellis in Cyprus can expound on the physics in greater
> depth.
>
> Doug Pauls
> Rockwell Collins
>
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