Indeed, Mike - what I foolishly ignored (to my own detriment!) is that while
the air inside the ball DOES weigh several ounces, I forgot that it's immersed in air of similar density and composition, so the DIFFERENCE in weight (which is what I was thinking about) is a very small number (accounted for only by the pressure increase above the air outside the ball.)
I apologize to Uberbots for typing before thinking, and humbly thank Mike for pointing out the error.
No matter who you think you are, you can still get trapped by your own mind. If it really matters, ask a colleague for a reality check.
Don
