Can you swim faster in water or in syrup?

by on February 11, 2006 at 8:57 am in Science | Permalink

Here is the answer, obtained by experimentation.  This is a fundamental question of applied physics, namely when "viscous drag" becomes a dominant force. 

It is amazing how heavily this investigation was regulated:

The most troublesome part of the experiment was getting permission to do it in the first place. Cussler and Gettelfinger had to obtain 22 separate kinds of approval, including persuading the local authorities that it was okay to put their syrup down the drain afterwards.

Gabe February 11, 2006 at 9:25 am

Didn’t this paper win an Ig Nobel prize a year or two ago?

Paul N February 11, 2006 at 4:47 pm

I.e., novelty wins you points in Chemical Engineering as well as Economics.

Ed Cussler is a great teacher, although my Chem Eng year at MN only had him for a couple of guest lectures instead of a whole class.

Barry P. February 11, 2006 at 11:35 pm

Takhir:

The sugar doesn’t melt, it goes into solution, or you can say that it dissolves.

You can typically dissolve more of a substance at higher temperatures, although this is not universally true – there are a few paris of chemicals that demonstrate lower soluobility at higher temperatures. But those are rare.

The reason for the temperature dependence has to do with the interaction of the molecules: for a substance to dissolve, its molecules have to be more inclined to interact with the solvent. When you reach thes saturation point, the sugar is more inclined to interact with other sugar molecules, and thus form crystals. At higher temperatures, the molecules are moving around a lot more and thus are less likely to interact with “like” molecules.

To explain more, you need to get into thermodynamics, which I don’t want to do here.

BTW, this is the same reason to doesn’t snow much when the temperature is very cold (like, -30) – at those temperatures, the air is too cold to carry enough water vapor to form clouds. That’s why the coldest days back home in Edmonton are often the clearest.

still working it out February 13, 2006 at 7:24 pm

The girlfriend agreed. It was a complete waste of money.

shashi May 23, 2006 at 6:35 am

do you have any mind stupid????????

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