On Tue, 07 Aug 2007 18:31:41 -0000, Jim Logajan wrote:

So when Jeppesen said "assuming all other variables remain constant" it
was basically saying "assuming the density remains constant."

Are you pretty comfortable with that statement? I can't imagine why
Jeppesen would bother to publish the paragraph if the assumption was that
the density would remain constant, which is basically impossible outside
the laboratory, (at least, as far as I know) and makes whole statement of
no value to a pilot in the real world.

"Assuming all other variables remain constant". - I picture two barometers
a few miles apart on a consistent, flat surface. There is no wind and the
sky is overcast. A hole in the overcast opens up and heats the area around
the first barometer. If I correctly interpret what Jeppesen appears to be
saying, the pressure in the area of the heated barometer will rise above
the barometer in the shade.


--
Dallas