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Publisher Information - 17.11.2008

Physical Properties Sources Index (PPSI)

Acentric Factor

Acentric Factor
Definition:The acentric factor is defined by ω = - log pvap,r - 1, where pvap,r = p/pc = reduced vapor pressure at reduced temperature Tr = T/Tc = 0.7, pc = critical pressure, Tc = critical temperature. If the boiling point Tb of a compound is known, ω can be calculated as ω = 3/7 Tb (Tc - Tb)-1 log (pc/p0) - 1 at p0 = normal pressure = 1 atm.
Originally, the acentric factor represented the acentricity or nonsphericity of a molecule; for spherical molecules ω = 0. At present, it is used as measure for the complexity of a molecule with respect to both the geometry and polarity. The compressibility factor and the entropy of vaporization can be expressed as power series of ω (K.S. Pitzer et al., J. Am. Chem. Soc. 77, 3433 (1955)).
Units:dimensionless
Symbol:ω
Scope note:Liquids
Synonyms:Pitzer’s Acentric Factor
Translation: DEAzentrischer Faktor
FRFacteur acentrique

Sources

TitleAuthor(s)MediumLocationRankSorted ascendingQualityRatingQuantitySource typeSystems
Yaws' Handbook of Thermodynamic and Physical Properties of Chemical CompoundsYaws Carl L.OnlineOnline
(Subscription)
11
2.2
Ca. 5'000 compoundsData (calculated)Organic Compounds
Chemical Properties HandbookYaws Carl L.OnlineOnline
(Subscription)
12
4.8
343 inorganic compounds / 1'358 organic compoundsData (calculated)Inorganic Compounds Organic Compounds
Handbook of Thermodynamic Diagrams, Vol. 1 : Organic Compounds C1 to C4 Yaws Carl L.OnlineOnline
(Subscription)
12
4.3
323 compoundsData (calculated)Organic Compounds
Handbook of Thermodynamic Diagrams, Vol. 2 : Organic Compounds C5 to C7Yaws Carl L.OnlineOnline
(Subscription)
12
4.5
367 compoundsData (calculated)Organic Compounds
Handbook of Thermodynamic Diagrams, Vol. 3 : Organic Compounds C8 to C28Yaws Carl L.OnlineOnline
(Subscription)
12
4.5
363 compoundsData (calculated)Organic Compounds
Handbook of Thermodynamic Diagrams, Vol. 4 : Inorganic Compounds and ElementsYaws Carl L.OnlineOnline
(Subscription)
12
4.5
343 compoundsData (calculated)Inorganic Compounds
InfothermFIZ Chemie BerlinOnlineOnline
(Free)
11
NaN
Ca. 2500 valuesData (measured)Inorganic Compounds Organic Compounds
Thermodynamik : Physikalisch-chemische Grundlagen der thermischen VerfahrenstechnikLüdecke Christa ; Lüdecke DorotheaPrint348 B22
3.5
Data (calculated)
The Properties of Gases and LiquidsReid Robert C. ; Prausnitz John M. ; Poling Bruce E. Print351 C22
3.1
Data (calculated)Gases Liquids
Physical and Thermodynamic Properties of Pure Chemicals : Data CompilationDaubert T.E. ; Danner R.P.Print592 C21
2
Data (calculated)
Perry's Chemical Engineers' Handbook (7th Edition)Perry, R.H. ; Green, D.W.OnlineOnline
(Subscription)
22
3.5
Data (calculated)Inorganic Compounds Organic Compounds
Thermodynamic Data for Pure Compounds : Part A : Hydrocarbons and KetonesSmith Buford D. ; Srivastava RakeshPrint592 E22
3.5
Data (calculated)Hydrocarbons
Thermodynamic Data for Pure Compounds Part B : Halogenated Hydrocarbons and AlcoholsSmith Buford D. ; Srivastava RakeshPrint592 E22
3.5
Data (calculated)Hydrocarbons
Recommended Data of Selected Compounds and Binary Mixtures : Dechema Chemistry Data Series Vol. 4Print591 D22
3.5
Data (calculated)
Handbook of the thermodynamics of organic compoundsStephenson Richard Montgomery ; Malanowski StanislawPrintNEBIS22
3.5
Data (calculated)Organic Compounds Liquids
Thermophysical properties of fluids : an introduction to their predictionAssael Marc J. ; Trusler J. P. Martin ; Tsolakis Thomas F.PrintNEBIS22
3.5
104 compoundsData (calculated)Organic Compounds
The properties of gases and liquidsPoling Bruce E. ; Prausnitz John M. ; O’Connell John P.PrintNEBIS22
2.5
468 compoundsData (calculated)
CRC Handbook of Solubility Parameters and Other Cohesion ParametersBarton Allan F.M.Print590 E32
2.5
Data (calculated)
API Technical Data Book - Petroleum RefiningPrint591 B32
3
Data (calculated)
Data Prediction ManualPrint591 B32
3.8
PredictionOrganic Compounds
Critical Properties CalculatorOnlineOnline
(Free)
33
1.8
Prediction

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