ICSE Class 9 Answered
Why are weather observation balloons partially filled with helium gas at ground level?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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 | 04 Jun, 2014, 03:23: PM
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