"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

"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".

"JoeSpareBedroom" wrote in message
...
"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".


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

"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.

Eisboch

"Eisboch" wrote in message
. ..

"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.

Eisboch



Hmmmmm.......

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.

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.

"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.

"JoeSpareBedroom" wrote in message
...
"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".


should not freeze at the 5F. But there will be some cooling via evaporation
but that is not "wind chill".

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
ick 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?

Evaporation drives this. Evaporation cools things off; it can cool
things off below ambient temperature, despite multiple people in this
thread saying it can't. Think about how an evaporative cooler works,
or why an alcohol wipe is cool.
Increasing the surface area increases the rate of evaporation. A film
smeared across your windshield by the frozen wipers will evaporate
quickly, leaving a nice thin sheet of ice. Wind, real or apparent
from the car's motion, also increase the rate of evaporation. I also
expect that the alcohol in the solvent evaporates more quickly than
the water, so the ice on the window is mostly water.