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Why are weather observation balloons partially filled with helium gas at ground level?

Asked by Topperlearning User 4th June 2014, 1:23 PM
Answered by Expert
Answer:
On higher altitudes atmospheric pressure decreases. Thus, the balloon starts expanding because of pressure inside and outside the balloon. Thus, to allow expansion, such that the fabric of balloon does not burst, the balloon is partially filled with helium gas at ground level.
Answered by Expert 4th June 2014, 3:23 PM
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