The partial pressures of Na, Na2, Hg over sodium amalgams are described for sodium mole fractions 0.55-1.00 over the range 700-1300 K. These data are extrapolated from some recently published results of the determination of the total vapour pressure over sodium amalgams and the activity of sodium in the liquid amalgams. The data are essential for calculation of the total vapour pressure and vapour phase composition above sodium amalgams in discharge lamps where the dose is partially evaporated.
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