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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 pressurc, will the balloon rise up?
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