The diffusion of argon and tritium in liquid nitrogen

Summary

The diffusion coefficient of A and HT in liquid N₂ have been measured by using the capillary method, at low concentrations, at constant pressure (about 70 cm Hg), within a range of temperature from 67 to 76^oK. The results can be expressed by the following equations

$$\begin{gathered} D\left( {A - N_2 } \right) = 730{\text{ exp}}\left[ { - \frac{{260}}{T}} \right] \cdot 10^{ - 6} cm^2 /s, \hfill \\ D\left( {HT - N_2 } \right) = 1260{\text{ exp}}\left[ { - \frac{{260}}{T}} \right] \cdot 10^{ - 6} cm^2 /s, \hfill \\ \end{gathered} $$

These results are discussed in terms of the dependence of the diffusion coefficient upon the molecular parameters of the different substances.

Riassunto

Si sono misurati a basse concentrazioni e a pressione costante (circa 70 cm Hg) in un campo di temperature da 67 a 76 °K i coefficienti di diffusione dell’A e di HT in N₂ liquido servendosi del metodo del capillare. I risultati si possono esprimere con le seguenti equazioni

$$\begin{gathered} D\left( {A - N_2 } \right) = 730{\text{ exp}}\left[ { - \frac{{260}}{T}} \right] \cdot 10^{ - 6} cm^2 /s, \hfill \\ D\left( {HT - N_2 } \right) = 1260{\text{ exp}}\left[ { - \frac{{260}}{T}} \right] \cdot 10^{ - 6} cm^2 /s, \hfill \\ \end{gathered} $$

Si discutono tali risultati in termini della dipendenza del coefficiente di diffusione dai parametri molecolari delle differenti soluzioni.