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:grin2:

....I think someone explained that..........

It IS.

I got to spend a day taking a course on cabin depressurization in the Air Force high altitude chamber in the spring of 2000 at Langley. What a blast! (literally)

Correct. More like about 7 - 8 thousand, but close enough. No one can bring cabin altitude down to sea level above a handful of thousands.

Did you think I was suggesting otherwise?

Since we live in an atmosphere, folks often use the term "negative pressure" to indicate less than atmospheric. In an aircraft with a pressurized cabin, it is easy to think of the low pressure...

Think of a check valve.

Copper is able to break into "layers." If you had a crack on the outside and a layer of copper directly beneath it, then increasing the pressure would force the layer...

Sometimes these things are just a matter of terminology and personal experience. The key is to remember that we are all learning, every day, IF we are doing this right.

Yep. It is possible to have a "one way" leak.