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2015-06-07T04:23:42+08:00

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There is an experiment to be done, it was represented by 2 ballon attached to a straw and put inside in a bottle.
So if you pull down the ballon at the bottom of the bottle. The 2 ballon inside will go big. and when you push it ,the ballons will shrink.
This experiment represent our Lungs. That how we breathe.

COLLINSDAX.. :)
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2015-06-07T15:49:02+08:00
Why my question you did not answer?
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