空氣的浮力Buoyancy of air
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1:59
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這個很沒趣味.....
但恭喜你發明了胃片減肥法
tomu921 1 year ago
甚魔是 "care" 掣??
idsun 2 years ago
Ah i finally see.
The inflating balloon allows the volume of the container to increase, but it still weights the same - therefore it's overall density has reduced.
(same weight, but now a bigger size)
Thus - as a whole it has become less dense.
very interesting experiment
roidroid 3 years ago