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Re: S40 Performance/Apologies S40-V40 2000

posted by  someone claiming to be Mehul on  Tue Jan 23 05:32 CST 2001 [RELATED]

> Does colder air move slower than warm air? I havn't taken any fluid

> or gas dynamics classes yet... but I wonder, is drag reduced by cold

> air significantly?

Once you get to your Fluid mechanics class you will learn that temperature has a strong effect and pressure has a moderate effect on viscosity (look at your motor oil). You can approximate the this phnomenon with the Sutherland law. Drag is therefore INCREASED with cold weather. It has nothing to do with the speed of the air, cold air can move just as fast as warm air.

I think that you are probably right about the humidity though.





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