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  #16  
Old 02-11-2011, 12:33 AM
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I am still shocked that it can be pondered whether antifreeze helps the engine warm itself up.
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  #17  
Old 02-11-2011, 01:16 AM
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FYI

Antifreeze - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Antifreeze





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  #18  
Old 02-11-2011, 01:47 AM
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@JEBalles,
I disagree. Not to get into an argument but you may want to look that one up.
I am a Power Engineer specializing in water treatment.
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  #19  
Old 02-11-2011, 12:06 PM
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Quote:
Originally Posted by JEBalles View Post
Just for the record, this is false. Surface tension is a result of intermolecular forces, not impurities.

Nope.

Surfactant = surface active agent; any compound that has greater activity at the surface, whether "impurity" or "intentional".

The test is simple. Take a sample of water. Put it in a sealed bottle. Shake it. Do you see any bubbles/foam that persists once you stop agitating?

If so a surfactant is present.

Last edited by sjh; 02-11-2011 at 12:22 PM.
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  #20  
Old 02-11-2011, 02:34 PM
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I ain't calling anybody out here, but I don't understand how distilled water could have no surface tension. You saying a water skipper would drown in it?

I use bottled distilled water in my espresso pot, so just to see, I poured some into a clean glass and put a staple in. It floats on the surface tension just fine. I poke it with a fork, it sinks to the bottom.

So ... what gives?
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  #21  
Old 02-11-2011, 04:35 PM
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Originally Posted by FinnJohn View Post
I ain't calling anybody out here, but I don't understand how distilled water could have no surface tension. You saying a water skipper would drown in it?

I use bottled distilled water in my espresso pot, so just to see, I poured some into a clean glass and put a staple in. It floats on the surface tension just fine. I poke it with a fork, it sinks to the bottom.

So ... what gives?
Gosh who would or did say that?

The prior remark was that contaminants could not influence surface tension. That is incorrect; they may or may not, depending on whether they are present at the interface in sufficient quantity and if the balance of inter- to intra- molecular forces is altered.

The original question, as I heard it, was:

Given two identical cars, one filled with water, one with a 50-50 antifreeze, which warms up quickest.

I replied the mixture has a lower heat-carrying capacity. Someone else replied that the efficiency of the heat transfer will probably be improved because of additives. I'm comfortable with both comments.

Someone else said the comment about contaminants and surface tension. I did not agree with that comment.

Anyway --> Use a good 50-50 mixture and take good care of your car seems to be something we can all agree on!

Last edited by sjh; 02-11-2011 at 08:27 PM.
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