Section: 4 | Vapor Pressure of the Metallic Elements - Equations |
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How to Cite this Reference
 The recommended form of citation is: John R. Rumble, ed., CRC Handbook of Chemistry and Physics, 103rd Edition (Internet Version 2022), CRC Press/Taylor & Francis, Boca Raton, FL. If a specific table is cited, use the format: "Physical Constants of Organic Compounds," in CRC Handbook of Chemistry and Physics, 103rd Edition (Internet Version 2022), John R. Rumble, ed., CRC Press/Taylor & Francis, Boca Raton, FL.

# VAPOR PRESSURE OF THE METALLIC ELEMENTS - EQUATIONS

C. B. Alcock

This table gives coefficients in an equation for the vapor pressure of 65 metallic elements in both the solid and liquid states. Vapor pressures in the range 10-10 to 102 Pa (10-15 to 10-3 atm) are covered. The equation is:

for p in atmospheres: log(p/atm) = A + BT -1 + ClogT + DT -3
for p in pascals: log(p/Pa) = 5.006 + A + BT -1 + ClogT + DT -3
for p in torr (mmHg): log(p/torr) = 2.881 + A + BT -1 + ClogT + DT -3

where T is the temperature in K. This equation reproduces the observed vapor pressures to an accuracy of 5% or better. The table in “Vapor Pressure of the Metallic Elements — Data” in this section gives values of the vapor pressure at several temperatures in the 400 K to 2400 K range, as calculated from these equations.

Column definitions for the table are as follows.

 Column heading Definition Name Name of element; the metallic elements are listed alphabetically by name Symbol Atomic symbol of element Phase Phase for which the vapor pressure equation applies A Numerical constant in vapor pressure equations above B Coefficient of T-1 term in vapor pressure equations above C Coefficient of logT term in vapor pressure equations above D Coefficient of T-3 term in vapor pressure equations above Temp. range Temperature range of applicability of vapor pressure equations, in K tmp Melting point of solid phase, in K

The equations and coefficients are reprinted with permission of Pergamon Press.

# Reference

## Vapor Pressure of Metallic Elements: Equation Coefficients

 Name Symbol CAS Reg. No. Phase A B C D Temp. range/K tmp/K Continued on next page... Aluminum Al 7429-90-5 solid 9.459 -17342 -0.7927 298-mp 933 Aluminum Al 7429-90-5 liquid 5.911 -16211 mp-1800 933 Americium Am 7440-35-9 solid 11.311 -15059 -1.3449 298-mp 1449 Barium Ba 7440-39-3 solid 12.405 -9690 -2.2890 298-mp 1000 Barium Ba 7440-39-3 liquid 4.007 -8163 mp-1200 1000 Beryllium Be 7440-41-7 solid 8.042 -17020 -0.4440 298-mp 1560 Beryllium Be 7440-41-7 liquid 5.786 -15731 mp-1800 1560 Cadmium Cd 7440-43-9 solid 5.939 -5799 298-mp 594 Cadmium Cd 7440-43-9 liquid 5.242 -5392 mp-650 594 Calcium Ca 7440-70-2 solid 10.127 -9517 -1.4030 298-mp 1115 Cerium Ce 7440-45-1 solid 6.139 -21752 298-mp 1072 Cerium Ce 7440-45-1 liquid 5.611 -21200 mp-2450 1072 Cesium Cs 7440-46-2 solid 4.711 -3999 298-mp 302 Cesium Cs 7440-46-2 liquid 4.165 -3830 mp-550 302 Chromium Cr 7440-47-3 solid 6.800 -20733 0.4391 -0.4094 298-2000 2180 Cobalt Co 7440-48-4 solid 10.976 -22576 -1.0280 298-mp 1768 Cobalt Co 7440-48-4 liquid 6.488 -20578 mp-2150 1768 Copper Cu 7440-50-8 solid 9.123 -17748 -0.7317 298-mp 1358 Copper Cu 7440-50-8 liquid 5.849 -16415 mp-1850 1358

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