"Short Wave Sportfishing" wrote in message
ups.com...
On Feb 8, 7:59 am, "JoeSpareBedroom" wrote:
"Eisboch" wrote in message

. ..







"JoeSpareBedroom" wrote in message
...

What about when it hits the windshield, under those same conditions?

Wind will cause an object to lose heat faster ... but will not cool it
below the ambient temperature.

The evaporation of a liquid is a state change whereby energy is used
and
heat is given off.

Wind chill is a measurement of rapid cooling of living tissue.

Eisboch

We're going in circles. Stop focusing on the words "wind chill". Focus
on
this: Assume you're a chemist, and you know for a fact that you
personally
have correctly created windshield washer fluid that doesn't freeze at (to
pick a number) zero F., why does that fluid actually freeze at a higher
temperature, say 5 F., when the vehicle is moving and the fluid hits the
windshield?

Since this phenomenon actually occurs, please base your next response on
that reality. Possible responses:
- "I don't know".
- "Here's why:...."
- "I'm posting a non-answer because I have nothing better to do".- Hide
quoted text -

- Show quoted text -


Eisboch has it right - it's condensate that freezes, not the actual
washer fluid.

Ehen you clear the wind screen with fluid on a cold morning, the
frost will disappear until the latent vapor in the atmosphere
re-freezes - that continues until two things happen - you warm up
the wind screen sufficiently to keep the vapor from freezing or until
you are moving fast enough for the vapor to be disappated (sp?)
before it has a chance to freeze.


Just e-mailed this question to my kid's physics teacher, who's always up for
a challenge. We'll see what he says. The condensate idea sounds plausible,
though.