It's been a while since we've had a good old-fashioned physics debate, so let's have one now. Would a swimmer swim faster in H2O or D2O? Assume a 400m Olympic race.
Isn't it obvious that the times would be slower? D2O is denser and more viscous than H2O, which would seem to be a double whammy. A little bit more density might help keep the swimmers relatively higher in the water, reducing their profile, but I doubt that would be significant at the Olympic level, since they are already about as streamlined as you can get. The extra enery required to move through a more viscous and more dense aquatic environment would certainly overwhelm whatever advantage being a bit higher in the water provides.
I thought I read somewhere that some physicists proved that swimming in water and swimming in molasses would be about the same speed? Something about the swimmer being able to apply more force against the fluid which cancels out the higher viscosity. Not completely impossible, but sounds a bit rum to me.
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Isn't it obvious that the times would be slower? D2O is denser and more viscous than H2O, which would seem to be a double whammy. A little bit more density might help keep the swimmers relatively higher in the water, reducing their profile, but I doubt that would be significant at the Olympic level, since they are already about as streamlined as you can get. The extra enery required to move through a more viscous and more dense aquatic environment would certainly overwhelm whatever advantage being a bit higher in the water provides.
Well, if you think that one is too easy, what about H2-18O vs. D2-16O?
Any links to the density and viscosity of those two compounds?
I thought I read somewhere that some physicists proved that swimming in water and swimming in molasses would be about the same speed? Something about the swimmer being able to apply more force against the fluid which cancels out the higher viscosity. Not completely impossible, but sounds a bit rum to me.
Now that's what I call a physics debate. Methinks Eric has done fluid dynamics more recently than the rest of us.
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