Sublimation Pressure of Solids

Face-centered cubic argon is the stable solid phase of pure argon, but upon the addition of as little as 1 percent of N2 to Ar, the solid phase crystallizes with the close-packed hexagonal structure. A study of the sublimation pressures of solid solutions of Ar with small amounts of N2 would give valuable information concerning the hexagonal phase, and such a study could be made with the apparatus used in this experiment. 

The sublimation pressure of solid Nbl5 is the pressure of gaseous Nbl5 present in equilibrium with the solid. It is given by the empirical equation... 

At extremely high and at extremely low temperatures a complete breakdown of the purely empirical rule is to be expected according to our approximation formula. Two cases of this sort, which are particularly telling, have been calculated out by Wintemitz (98a), namely, the sublimation pressure of solid tungsten and that of solid hydrogen. 

Structures of Common Amino Acids, 7-3 to 4 Student s t-distribution, A-91 Sublimation Pressure of Solids, 6-59 to 60... 

One handbook lists the sublimation pressure of solid benzene as a function of Kelvin temperature, T, as log P (mmHg) = 9.846 - 2309/T. Another handbook lists the vapor pressure of liquid benzene as a function of Celsius temperature, t, as log P (mmHg) = 6.90565 — 1211.033/(220.790 + t). Use these equations to estimate the normal melting point of benzene, and compare your result with the listed value of 5.5 C. 

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