Of common gases {HEAD ~ only deuterium}, helium and neon have thermal conductivities of the same order of magnitude as hydrogen and even those gases have {TAIL ~ thermal conductivities} far lower than hydrogen 
Of common gases { HEAD ~ only deuterium } , helium and neon have thermal conductivities of the same order of magnitude as hydrogen and even those gases have { TAIL ~ thermal conductivities } far lower than hydrogen
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH