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Old 10-02-2012, 08:05 PM   #29
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Join Date: Feb 2004
Posts: 13,746

Originally Posted by diggler View Post
I think it depends on how the balls are made.

I read somewhere that when some balls are made, a pellet is put inside when they join the 2 halves together. The pellet sublimates from solid to gas and hence creates gas pressure.

Other balls are just air filled.
So that is why some balls rattle when shaken
You can't have everything. Where would you put it?
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