Hydrogen cools the best because it's the fastest [2 g / mol], Air slower [~ 29 g / mol], Argon slower [40 g / mol], CO2 slower [44 g / mol], and
various noble gasses like Radon slower still.
Not exact matches
Because different
noble gases move at
various speeds through rock and water, the proportions present revealed that although the
gases had come from deep underground, they had arrived directly rather than percolating through layers of rock and water (PNAS, DOI: 10.1073 / pnas.1322107111).
Greg Holland, a postdoctoral researcher in isotope geochemistry at the University of Manchester in England, and his colleagues measured the amounts of
various isotopes of
noble gases in the Bravo Dome
gas field in New Mexico, where magmatic
gases — primarily carbon dioxide — that allow the mantle to be sampled are buried hundreds of meters below.