Carbon dioxide, e.g. (3)
I believe the answer is:
gas
(Other definitions for gas that I've seen before include "Nitrogen, say" , "Talk idly; fuel" , "Something exciting" , "eg Helium" , "American fuel" .)
I believe the answer is:
gas
(Other definitions for gas that I've seen before include "Nitrogen, say" , "Talk idly; fuel" , "Something exciting" , "eg Helium" , "American fuel" .)