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Why gas filled balloons rise up, only to...

Why gas filled balloons rise up, only to a certain height ?

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Will the gas filled inside the balloon have density ?
Will density of the air decrease with increase in height above the sea level ?
Then what happens to the atmospheric pressure at higher altitudes ?
Do the objects always move from higher pressure area to lower pressure area ?
When the pressure inside the balloon equals to the atmospheric pressure, will the balloon rise up ?
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