Here's why:...


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Posted by Eins on November 22, 2000 at 21:35:49:

In Reply to: If Helium is really an inert gas, then why ... posted by Eins on November 18, 2000 at 11:48:33:

with a little more observation and experimenting, I found the answer: it is the sun's UV rays that make the difference. They alter or age the rubber so that it won't shrink back to its unstretched size. The He-filled balloons were out in the sun while the air-filled control ballon was protected, indoors. Voilá.

Eins


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