One is that atmospheric pressure is dramatically reduced at high altitudes, so a helium balloon expands as it rises and eventually explodes. If you inflate a balloon beyond its limits at room ...

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Production of carbon dioxide from reaction of citric acid and baking soda ...

The massive helium balloons that will float through New York ... one of dozens of people helping inflate the stars of ...

The first super pressure balloon flight of NASA's New Zealand Balloon Campaign reached its float altitude after lifting off ...