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**[email protected]**

wrote:

Sailplaners will have a good understanding of natural air flow.
This text seems to suggest that you can take an unenclosed 'parcel'
of air, and move it through the surounding air, like you can throw
a solid object through the air.
== Chris Glur.

Chris,
What is happening is that the parcel has momentum, which is conserved.
The momentum vector remains intact in the air until it is dissipated by
friction. Think of it as billiard balls passing along the momentum.
Jim Ketcham