Physical Properties of Alkali Metals

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Sodium

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Atomic number 11
Atomic weight (based on C=12) 22.9898
Natural isotopes (mass number) 23
Istotopic abundance 100%
Absorption cross-section to 0.025-ev (thermal) neutrons 0.53 barn
Total cross-section to 0.025-ev (thermal) neutrons 3.9 barns
Ionization potential 5.12 volts
Melting point 97.82°C (208.1°F)
Boiling point 881.4°C (1618°F)
Volume increase on melting 2.7%
Latent heat of fusion 27.0 cal/g
Latent heat of vaporization at the boiling point 926 cal/g
Critical temperature 2733°K (estimate)
Critical pressure 408 atm (estimate)
Critical volume 0.128 cm3/gram-mole (estimate)
Density (solid) 20°C
m.p.		 0.968 g/cm3
0.951 g/cm3
Density (liquid) m.p.
400°C
550°C
b.p.		 0.927 g/cm3
0.856 g/cm3
0.820 g/cm3
0.740 g/cm3
Specific volume (saturated vapor) 400°C
550°C
b.p.		 3.8 x 106 g/cm3
2.3 x 105 g/cm3
3.7 x 103 g/cm3
Viscosity (liquid) 100°C
400°C
550°C
b.p.		 0.680 centipoise
0.284 centipoise
0.225 centipoise
0.149 centipoise
Surface tension m.p.
400°C
550°C
b.p.		 192 dynes/cm
161 dynes/cm
146 dynes/cm
113 dynes/cm
Electrical resistivity (solid) 20°C
m.p.		 4.69 µΩcm
6.6 µΩcm (estimate)
Electrical resistivity (liquid) m.p.
400°C
550°C
b.p.		 9.64 µΩcm
22.14 µΩcm
29.91 µΩcm
52.87 µΩcm
Thermal conductivity (solid) 20°C
m.p.		 1.323 W/cm-°C
1.193 W/cm-°C (estimate)
Thermal conductivity (liquid) m.p.
400°C
550°C
b.p.		 0.870 W/cm-°C
0.722 W/cm-°C
0.648 W/cm-°C
0.486 W/cm-°C
Specific heat (solid) 20°C
m.p.		 0.480 cal/g-°C
0.515 cal/g-°C
Specific heat (liquid) m.p.
400°C
550°C
b.p.		 0.331 cal/g-°C
0.305 cal/g-°C
0.300 cal/g-°C
0.307 cal/g-°C
Specific heat (vapor) b.p. 0.65 cal/g-°C

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