On Feb 8, 8:33 am, "Eisboch" wrote:
"Eisboch" wrote in message

. ..



All the above. The answer is blowing in the wind. Actually, it's because
the windshield is cold enough to selectively freeze the H20 content of the
"antifreeze". If you notice ... the wind does not even have to be blowing
in order to freeze a film on the windshield if you use the fluid and
wipers before the defroster starts to warm up the windshield.

I am focusing on wind chill because in your original post you confused
wind chill as being a factor of the temperature of a non-living object.
It isn't.

Eisboch

Actually, I think what I just said is incorrect. The freezing film you see
develop is water vapor in the air condensing and freezing on the cold
windshield. If you notice, the next squirt of washer fluid melts it, then
it occurs again and again until the windshield warms up.

Add that the "glass" is actually layered and you have a more
interesting
problem in that the inside of the glass is warmer than the outside
of the glass which causes more condensation in freezing conditions
and creates that "frosted" look and more use of that blue/pink stuff.

I just did an experiment because I was bored this morning. I
took two 12 inch dinner plates, placed one in the garage away
from the wind and one in a shady area exposed to the wind.
I placed an equal amount of tap water in each plate and waited
to see which froze first.

The freezing of each took the same amount of time.

So, there is the experiment.