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Unformatted text preview: w: Continuum –vs‐ free molecule flow (fluid dynamics –vs‐ statistical mechanics) If λ << l there are so many collisions with the body of size l that no one of them is distinguishable. It is as if there is a continuous media acting on the body. If λ and l are the same order then individual collisions matter and you have to use statistical mechanics Inviscid –vs‐ viscous We don’t live in a world without friction. A body in motion doesn’t remain in motion because there is a force acting to resist its motion, friction. We can make very low‐friction systems like an air hockey table, but there is always a small amount of friction. There are practical cases where the friction is so small we can neglect it. It is sometimes si...
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This note was uploaded on 01/19/2014 for the course AEEM 2042C taught by Professor Munday during the Fall '10 term at University of Cincinnati.

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