It's pumped (3)
I believe the answer is:
gas
(Other definitions for gas that I've seen before include "eg Helium" , "Oxygen is one" , "Hydrogen or methane, say" , "chew the fat" , "Hydrogen or oxygen, say" .)
I believe the answer is:
gas
(Other definitions for gas that I've seen before include "eg Helium" , "Oxygen is one" , "Hydrogen or methane, say" , "chew the fat" , "Hydrogen or oxygen, say" .)