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Experimental values for the viscosity of the radioactive hydrogenisotopologue tritium are still unknown in literature. Existing values from abinitio calculations disregard quantum mechanic effects and are therefore onlygood approximations for room temperature and above. To fill in these missingexperimental values, a measurement setup has been designed, to measure theviscosity of gaseous hydrogen and its isotopologues (H$_2$, HD, HT, D$_2$, DT,T$_2$) at cryogenic temperatures. In this paper, the first results with thisCryogenic Viscosity Measurement Apparatus (Cryo-ViMA) of the viscosity ofgaseous hydrogen between 200 K to 300 K are presented.

Viscosity measurements of gaseous H2 between 200 K to 300 K with a spinning rotor gauge