Abstract
The equation of state of solid sodium metal is derived in order to provide an additional tool for the calibration of very high-pressure devices. The derivation divides itself naturally into two parts. The first part contains a calculation of the 0°K isotherm, which is based on the already well-developed theory of the alkali metals. In the second part, the thermal contribution to the pressure is determined. The calculations in this part include an evaluation of the Grüneisen parameter and an estimate of anharmonic effects. The comparisons which are made between theory and experiment show the over-all agreement to be quite good.

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