Answer
Since helium molecules are very small in size, they can escape the porous surface of the balloons, which cause in gradual reduction of helium in the balloon, and hence it comes down over time.
Work Step by Step
As above
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 12 - Sections 12.1-12.8 - Exercises - Conceptual Problems - Page 594: 138
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