[DVBC] Physics question

[david c bennett]

Hey Bpb,

It sounds like its time to publish the first Science Issue of the Newsletter 
of the DVBC.
----- Original Message ----- 
From: "eric zwicky" <zwicky2 at comcast.net>
To: <dvbc-list at dvbc.org>
Sent: Monday, January 22, 2007 8:26 AM
Subject: Re: [DVBC] Physics question


> beautiful!
>
>
> Doug Bower wrote:
>> Bob,
>>
>> Thermal heat characteristics is probably the most misunderstood physical
>> science.  People believe many "wives tales", such as using hot water in
>> ice cube trays freezes faster.  As far as your water bottle situation is
>> concerned, Bob used hot water and Bill used cold water.  Assuming both
>> water bottles were the same non-insulated type, the same size, and both
>> bicycles were traveling through cold air at the same speed the heat
>> transfer rate would be the same.  The only difference in temperature of
>> the water inside would be for the first few miles where Bob's hot water
>> bottles would be giving its heat up to the environment.  Once Bob's
>> bottles transferred their heat and became the same temperature as Bill's
>> the physical laws of freezing would be the same for both Bob's and
>> Bill's water bottles.  There is only one other factor that I didn't
>> mention yet.  The only other factor that needs to be considered is what
>> was inside the water?  Did Bob and Bill fill their water bottles from
>> the same well?  The only way you can change the temperature at which
>> pure water freezes is by adding chemicals.  For those of us that still
>> remember 9th grade Science class, if you add chemicals such as the
>> compound salt, you raise the temperature water freezes at.  So bill's
>> bottles must have had some trace chemicals such as Gatorade or Cytomax.
>> If this isn't the case I have one more idea...  If Bob and Bill filled
>> their clean uncontaminated bottles from the same source with the only
>> difference being Bob used hot water and Bill didn't the hot water tank
>> or the hot water system is removing compounds from the water that the
>> cold water system is allowing to pass.  A simple experiment could be
>> performed to test this theory.  Fill two clean shot glasses with water,
>> one using cold water and the other using hot water.  Both shot glasses
>> must be filled with the same volume of water.  Place a lid upon each
>> shot glass to prevent evaporation of any trapped chemicals and let them
>> both sit on the counter until they reach room temperature.  Place them
>> both next to each other in the freezer, check periodically to see if one
>> shot glass if freezing before the other.   Let me know hot the experiment 
>> worked, Doug
>>
>
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