Physical Properties of Sodium
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
Boiling point
881.4 °C
Volume increase on melting
2.7%
Latent heat of fusion
27 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/g-mole (estimate)
Density (solid)
20°C - 0.968 g/cm³
m.p. - 0.951 g/cm³
Density (liquid)
m.p. - 0.927 g/cm³
400°C - 0.856 g/cm³
550°C - 0.820 g/cm³
b.p. - 0.740 g/cm³
Specific volume (saturated vapor)
400°C - 3.8 x 10⁶g/cm³
550°C - 2.3 x 10⁵cm³
b.p. - 3.7 x 10³ g/cm³
Viscosity (liquid)
100°C - 0.680 cP
400°C - 0.284 cP
550°C - 0.225 cP
b.p. - 0.149 cP
Surface tension
m.p. - 192 dynes/cm
400°C - 161 dynes/cm
550°C - 146 dynes/cm
b.p. - 113 dynes/cm
Electrical resistivity (solid)
20°C - 4.69 µΩcm
m.p. - 6.6 µΩcm (estimate)
Electrical resistivity (liquid)
m.p. - 9.64 µΩcm
400°C - 22.14 µΩcm
550°C - 29.91 µΩcm
b.p. - 52.87 µΩcm
Thermal conductivity (solid)
20°C - 1.323 W/cm-°C
m.p. - 1.193 W/cm-°C (estimate)
Thermal conductivity (liquid)
m.p. - 0.870 W/cm-°C
400°C - 0.722 W/cm-°C
550°C - 0.648 W/cm-°C
b.p. - 0.486 W/cm-°C
Specific heat (solid)
20°C - 0.480 cal/g-°C
m.p. - 0.515 cal/g-°C
Specific heat (liquid)
m.p. - 0.331 cal/g-°C
400°C - 0.305 cal/g-°C
550°C - 0.300 cal/g-°C
b.p. - 0.307 cal/g-°C
Specific heat (vapor)
0.65 cal/g-°C