Alan Baker wrote:
In article ,
Beryl wrote:

Alan Baker wrote:
In article ,
Beryl wrote:

Alan Baker wrote:
It's like the downwash argument. You can say "IT DOESN'T MATTER", when
people argue that the air behind an aircraft is not deflected downward,
but it *does* matter. Having an accurate understanding of the physical
processes of flight matters.
It isn't really deflected downward, not for long anyway. It's churning
in a torus. Like a smoke ring.
No.

It really *is* deflected downward.


The edges of the deflected area churn, and the air that is deflected
ends up getting diffused among all the other air below *it*, but it
really is deflected downward.

And eventually, that downward deflection makes it way until it -- very
diffusely -- impacts upon the surface of the earth. That is the only
thing that finally stops it.
After more than 100 years of flight, the atmosphere still hasn't been
pushed down to the earth's surface.

Sorry, Beryl, but you're just wrong.

As I said, the atmosphere isn't getting any shorter. Do you disagree
with that?
Repeating that "the net flow is downward" isn't making progress.