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A balloon filled with helium does not ri...

A balloon filled with helium does not rise in air indefinitely, but halts after a certain height. Why ?

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**Step-by-Step Solution:** 1. **Understanding the Balloon's Behavior**: When a balloon is filled with helium and released into the air, it begins to rise. This is because helium is less dense than the surrounding air, creating an upward buoyant force. 2. **Pressure Dynamics**: As the balloon ascends, it experiences a decrease in atmospheric pressure. The pressure inside the balloon (due to the helium gas) is initially greater than the surrounding atmospheric pressure, causing the balloon to expand. 3. **Expansion of the Balloon**: The balloon continues to rise and expand as long as the internal pressure (from the helium) is greater than the external atmospheric pressure. This expansion continues until the balloon reaches a certain altitude. ...
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