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10 September, 20:05

Which is not an example of a lighter-than-air gas?

A. Argon

B. Hot air

C. Hydrogen

D. Helium

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Answers (2)
  1. 10 September, 20:15
    0
    I think the answer is A. Argon.
  2. 10 September, 20:18
    0
    Imma say the answer is A argon.
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