
To Explain: Helium weather balloons are normally released while filled to only 10% - 20% of their maximum volume.

Explanation of Solution
Introduction:
Atmospheric pressure decreases with increase in altitude.
Helium balloons when rise to high altitudes, the external pressure (atmospheric pressure) decreases but the pressure inside the balloon is same. When inside pressure is more than external pressure, then balloon expands. In such cases, if the balloon is filled to full volume then it will blast due to sudden expansion.
Conclusion:
To prevent the balloon from blast when it expands at higher altitudes, helium weather balloons are filled to only 10% - 20% of their maximum volume.
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