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md> Does anyone know of any lighter than air flammable gasses other
md> than hydrogen?

G’day: The answer is yes and no. Hydrogen IS the only pure
gas lighter than air, but coal gas commonly contains a high
percentage of hydrogen (plus carbon monoxide, carbon dioxide,
methane,etc) and is therefore lighter than air. Helium is of
course lighter than air but it is almost completely inert: it
won’t burn in air or any other atmosphere. Cheers

   / /    John Burgess, 
  / /
 / //\    @John_Burgess2
/ / \ \

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