Balloon Helium Leaking
Could you please explain for me why a balloon filled
with H2 or He has very little gas in it after 24 hours?
He and H2 molecules are small and easily escape through the thin wall of
the balloon or its outlet.
Dr. Ali Khounsary
Advanced Photon Source
Argonne National Laboratory
Argonne, IL 60439
Helium atoms are small, balloon material has small holes in it.
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Update: June 2012