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Vapor Pressure Calculator

Blue fields allow input; press <RETURN> to calculate.

Temperature K
Vapor Pressure
Gas Density atoms/m³ *
Evaporation/Subl. Rate atoms/(m²s) *
Erosion m/s *
Melting Temperature K
Vapor pressure at Melting P.

Start Temperature T1= K
End Temperature T2= K
Temperature Step= K


Accuracy: For many substances, vapor pressures are only poorly known; expect errors up to a few 10% of the vapor pressure value and up to approx. 10% of the temperature especially at high temperatures. For very low vapor pressures, errors can be much larger.

Note that for some substances, data are calculated only for the liquid state (Hg, methanol) or only for the solid state (noble gases Ne-Xe, methane, I).

* These quantities assume a monatomic gas (unless the substance is given as molecule); results will be inaccurate if there is a high fraction of dimers, trimers, etc in the vapor, like, e.g., in sublimation of graphite. Evaporation/sublimation rates assume a sticking coefficient (accommodation coefficient) of one (not valid for, e.g., graphite). Erosion rates are very inaccurate (no temperature-dependent density) and only shown for vapor pressures below 1 Pa.

Data sources: Most metals use the fits from C.B. Alcock, V.P. Itkin, M.K. Horrigan, Canadian Metallurgical Quarterly, 23, 309 (1984). When these data were not available or unreliable (e.g. large difference between vapor pressure of the solid and liquid phase at the melting point), fits to values from the wikipedia table, the CRC Handbook of Chemistry and Physics (78th edition, 1997, CRC press) and other sources were used. Si and Fe data from P.D. Desai, J. Phys Chem Ref Data 15, 967 (1986); Ru, Rh, Pd, Os, Ir, Pt data based on J. W. Arblaster, Platinum Metals Rev. 51, 130 (2007). Data for liquid H2O based on a fit to the ITS-90 table supplemented with a few points up to 1 MPa.

Copyright © by Michael Schmid, IAP/TU Wien Surface Physics Group 2013-2016. No warranty for correctness of results.

surface/vapor_pressure.txt · Last modified: 2016-02-03 20:47 by Michael Schmid