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Re: cooling water




The reply was very appropriate.

One of the most significant barriers to understanding physics that I find
in my students is the inappropriate use of words. If they can't
articulate it clearly, they don't understand it.

If we as physics teachers don't insist on precise terminology, careful
choice of words, and correct grammar, it's no wonder our students don't
understand anything when they finish the course.

In a culture where "bad" means good, I don't take anything for granted
even when they tell me, "That's what I meant."

Mervin Koehlinger

On Sat, 30 May 1998, Doug Benning wrote:


David,

I hope this was sarcastic. I think we all understand what he is asking --
that if you put water in the freezer in identical amounts and containers
will the starting temp. of the water have an effect on the rate at which it
reaches the freezing point at sea level. If so what effect does it have
and why. If your answer wasn`t meant to be cute or funny I really object
to your tone. Answer like these are the types of things that cuase not just
students but also many people on this list from asking questions.

Just my opinion

Doug Benning
Gyoshu High School
Shizuoka,Japan

At 22:14 98/05/29 EDT, you wrote:
There is a discussion in our building about which freezes faster warm water
or cold water. I seem to remember an article by Jerald Walker years ago
saying that warm water freezes faster. What are your ideas?

The way I see it, warm water doesn't freeze at all (unless it is
subjected to more than 10^4 atm of pressure, and the resulting solid
is then not ordinary ice anyway). At normal pressures only cold water
freezes.

David Bowman
dbowman@georgetowncollege.edu





Mervin Koehlinger
Physics Instructor
Concordia Lutheran High School
Fort Wayne, Indiana