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PF Gold
P: 2,551
 If it will ease your tortured mind, there is a special branch of fluid mechanics call "gas dynamics".
AHA! So, in fact, the statement that "Fluids include liquids, gases, and plasmas" is false, whereas it should says "fluid MECHANICS include liquids, gases, and plasmas".

And I rather resent you opening with "if it will ease your tortured mind", as though it's a silly issue to raise. Why I hold accuracy to be an important virtue.

 Fluids include liquids, gases, and plasmas
Interesting.. I'll read on that!

But another thing on wiki I wonder about

 Similarly, it can sometimes be assumed that the viscosity of the fluid is zero (the fluid is inviscid). Gases can often be assumed to be inviscid. If a fluid is viscous, and its flow contained in some way (e.g. in a pipe), then the flow at the boundary must have zero velocity
This is because the fluid sticks to the walls, right?