Furthermore, apart from helium and hydrogen, it is less dense than any liquid element, being only two thirds as dense as liquid nitrogen (0.808 g/cm3).
Bortset fra helium og hydrogen har det derudover mindre massefylde end noget flydende grundstof, idet dets massefylde er blot 2/3 af flydende kvælstofs (0,808 g/cm3).