[DVBC] Physics question

[Terry Strobaugh]

Freezing point depression and boiling point elevation are what is in effect here. It's why they salt roads and why you add salt to water for cooking (to raise the temperature and reduce cooking time). But it doesn't have to be salt or even a "solvable" compound, the same amount of particles of dirt or sand will accomplish the same effect. There could have been residual salt (spit) in the bottle that took longer to freeze.
Terry


 -------------- Original message ----------------------
From: "Pazos, Javier" <Javier.Pazos at GEOSC.com>
> Your chemistry teacher was wrong.  The reason warm or hot water FROM THE FAUCET 
> freezes faster is because impurities in suspension settle out while it is in the 
> hot water heater.  You can achieve the same effect by using filtered water (test 
> it-you'll see).  
> 
> Many things could have contributed to Bob's bottle freezing faster.  It could 
> have been the geometry of the bottle, the material the bottle was made of, the 
> materials that the bike and bottle cages are made of, etc.  It could also be 
> because of impurities.
> 
> Tom is absolutely right that adding Gatorade will slow the freezing.  Brandy 
> will also work-at least that's what the St. Bernards tell me.
> 
> -----Original Message-----
> From: dvbc-list-bounces at list.dvbc.org
> [mailto:dvbc-list-bounces at list.dvbc.org]On Behalf Of Tom Smyth
> Sent: Sunday, January 21, 2007 5:56 PM
> To: dvbc-list at dvbc.org; Bob LaDrew
> Subject: Re: [DVBC] Physics question
> 
> 
> As Cliff Claven would have said "Its a little known fact Normie" warm water 
> freezes faster than cold water because the warm water has less oxygen 
> content. At least that's what I learned in Chemistry class. The best way to 
> slow freezing is to add a little sodium (Gatorade) as this will lower the 
> freezing point of the water.
> ----- Original Message ----- 
> From: "Bob LaDrew" <bonkersboy at verizon.net>
> To: <dvbc-list at dvbc.org>
> Sent: Sunday, January 21, 2007 4:31 PM
> Subject: [DVBC] Physics question
> 
> 
> >    For today's ride I warmed up my bottle so it would go longer without 
> > freezing. Bill used cold water in his. Mine froze right up and Bill was 
> > able to drink out of his the entire ride.
> >    What is the operative law of physics at work here?
> >    Dougie, you wanna field this one?
> >    --Bob LaDrew
> >
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> 
> 
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