Weather Balloon Filling
Why is a weather balloon never filled completely with He when it is
As the balloon rises, the atmospheric pressure decreases. The volume of
the gas of the balloon will then increase. Therefore, the balloon needs
expansion room for the gas.
Nathan A. Unterman
At ground level, atmospheric pressure is much higher than up high. If the
balloon were completely filled, as the pressure outside the balloon dropped
as it flew higher, the balloon would try to expand to equalize the
pressure, and it would pop.
Donald Yee Ph.D.
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Update: June 2012