Another gas was used for many years to float transportation balloons.

which gas is it:

1) carbon dioxide
2) oxygen
3) hydrogen

why is this gas not used in balloons today?


Because a model would make the investigation easier to understand

first one is the correct answer

Another gas that was used to fill balloons was hydrogen. The reason why hydrogen is not used today is because it use to cause many fires when it was used to fill balloons up.

Hope I helped you! :)

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