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HOW TO MAKE A HEAVY BALLOON We all know that balloons, when inflated with helium, float because helium is lighter than air. But have you ever thought. - ppt download
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تويتر \ Balloon Archives على تويتر: "Here is an important one!! There are multiple types of #balloons: -Gas🎈: lift provided by a lighter-than-air gas, in general hydrogen or helium. -Hot air🎈: lift
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