Thread: Replacement Track Ball Ordering Information (link, details)
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Unread 01-02-2008, 14:45
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Re: Replacement Track Ball Ordering Information (link, details)
Did you account for the weight of the air in the ball? With that large volume of air it wouldn't take much pressure to give you the extra pound. I believe some threads mentioned 2-3 pounds mass at 1 atmosphere (I haven't checked their calcs), so only 5 psig would give you an extra 1 pound net weight (the first 1 atmosphere's worth doesn't show up as weight because it is offset by the same amount of buoyant force).
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