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My daughter is conducting a science project on “Does the weight of gases effect the length of time a balloon will stay inflated?

April 26, 2017balloon conducting daughter gases LENGTH project time weight

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My daughter is conducting a science project on “Does the weight of gases effect the length of time a balloon will stay inflated?

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oxygen, medical nitrogen and helium. She had thought the helium (being the lightest) would stay inflated the longest.) Not the case – helium deflated first, oxygen- 2nd, and nitrogen stayed inflated the longest. Oxygen is the heaviest of the 3 according to atomic weights.