Physical Properties of Alkali Metals

eutectic nak

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Eutectic composition 77.8 wt.% potassium
Melting point -12.6°C
Boiling point 785°C (estimate)
Volume increase on melting 2.5%
Density (liquid) m.p.
20°C
100°C
550°C		 0.875 g/cm3
0.867 g/cm3
0.855 g/cm3
0.749 g/cm3
Viscosity (liquid) m.p.
20°C
100°C
550°C		 1.3 centipoise
0.94 centipoise
0.505 centipoise
0.176 centipoise
Electrical resistivity (liquid) m.p.
20°C
100°C
550°C		 33.5 µΩcm (estimate)
38.0 µΩcm (estimate)
40.7 µΩcm (estimate)
72.0 µΩcm (estimate)
Thermal conductivity (liquid NaK, 77.7) 20°C
100°C
550°C		 0.218 W/cm-°C
0.232 W/cm-°C
0.262 W/cm-°C
Specific heat (liquid) m.p.
20°C
100°C
550°C		 0.233 cal/g-°C
0.232 cal/g-°C
0.224 cal/g-°C
0.208 cal/g-°C

Source: Sodium-NaK Engineering Handbook, Volume 1
Note: Creative Engineers takes no responsibility for the accuracy of this information.