Like a balloon, as long as those gas are not escaping. Then it will be effortless. Or may be require enegry to pump in oxygen when the gas volume started to decreased.
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Like a balloon, as long as those gas are not escaping. Then it will be effortless. Or may be require enegry to pump in oxygen when the gas volume started to decreased.
Ah, got point, with air then it can float. haha, nice one :)