The acentric factor is a conceptual number introduced by Kenneth Pitzer in 1955, proven to be very useful in the description of matter. It has become a standard for the phase characterization of single & pure components. The other state description parameters are molecular weight, critical temperature, critical pressure, and critical volume (or critical compressibility).The acentric factor is said to be a measure of the non-sphericity (centricity) of molecules. As it increases, the vapor curve is "pulled" down, resulting in higher boiling points. It is defined as: . where For many monatomic fluids

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  • El factor acéntrico se define como un parámetro necesario para calcular el factor de compresibilidad de un gas, éste mide la desviación en la presión de vapor de un compuesto, respecto a gases nobles como el criptón, xenón y argón (también llamados fluidos simples) para los cuales el factor acéntrico toma el valor de cero. (es)
  • Der azentrische Faktor nach Pitzer, auch Azentrizitätsfaktor genannt, ist eine dimensionslose Stoffgröße. Er dient in der Thermodynamik als Maß für die Abweichung eines Moleküls von der idealen Kugelform und wird hauptsächlich in thermischen Zustandsgleichungen für reale Gase angewendet, z. B. in der Soave-Redlich-Kwong-Zustandsgleichung oder in der Zustandsgleichung von Peng-Robinson. (de)
  • The acentric factor is a conceptual number introduced by Kenneth Pitzer in 1955, proven to be very useful in the description of matter. It has become a standard for the phase characterization of single & pure components. The other state description parameters are molecular weight, critical temperature, critical pressure, and critical volume (or critical compressibility).The acentric factor is said to be a measure of the non-sphericity (centricity) of molecules. As it increases, the vapor curve is "pulled" down, resulting in higher boiling points. It is defined as: . where is the reduced temperature, is the reduced saturation vapor pressure. For many monatomic fluids , is close to 0.1, therefore . In many cases, lies above the boiling temperature of liquids at atmosphere pressure. Values of can be determined for any fluid from accurate experimental vapor pressure data. Preferably, these data should first be regressed against a reliable vapor pressure equation such as the following: ln(P) = A + B/T +C*ln(T) + D*T^6 (This equation fits vapor pressure over a very wide range of temperature for most components, but is by no means the only one that should be considered.) In this regression, a careful check for erroneous vapor pressure measurements must be made, preferably using a log(P) vs. 1/T graph, and any obviously incorrect or dubious values should be discarded. The regression should then be re-run with the remaining good values until a good fit is obtained. The vapor pressure at Tr=0.7 can then be used in the defining equation, above, to estimate acentric factor. Then, using the known critical temperature, Tc, find the temperature at Tr = 0.7. At this temperature, calculate the vapor pressure, Psat, from the regressed equation. The definition of gives a zero-value for the noble gases argon, krypton, and xenon. is very close to zero for other spherical molecules. (en)
  • In termodinamica, il fattore acentrico (comunemente indicato con ) è un fattore originariamente proposto da Pitzer come espressione in un'equazione per il fattore di comprimibilità. (it)
  • Le facteur acentrique est un nombre conceptuel introduit par Kenneth Pitzer en 1955, couramment utilisé dans la description de la matière en thermodynamique, notamment pour la caractérisation de composés purs. (fr)
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  • El factor acéntrico se define como un parámetro necesario para calcular el factor de compresibilidad de un gas, éste mide la desviación en la presión de vapor de un compuesto, respecto a gases nobles como el criptón, xenón y argón (también llamados fluidos simples) para los cuales el factor acéntrico toma el valor de cero. (es)
  • Der azentrische Faktor nach Pitzer, auch Azentrizitätsfaktor genannt, ist eine dimensionslose Stoffgröße. Er dient in der Thermodynamik als Maß für die Abweichung eines Moleküls von der idealen Kugelform und wird hauptsächlich in thermischen Zustandsgleichungen für reale Gase angewendet, z. B. in der Soave-Redlich-Kwong-Zustandsgleichung oder in der Zustandsgleichung von Peng-Robinson. (de)
  • In termodinamica, il fattore acentrico (comunemente indicato con ) è un fattore originariamente proposto da Pitzer come espressione in un'equazione per il fattore di comprimibilità. (it)
  • Le facteur acentrique est un nombre conceptuel introduit par Kenneth Pitzer en 1955, couramment utilisé dans la description de la matière en thermodynamique, notamment pour la caractérisation de composés purs. (fr)
  • The acentric factor is a conceptual number introduced by Kenneth Pitzer in 1955, proven to be very useful in the description of matter. It has become a standard for the phase characterization of single & pure components. The other state description parameters are molecular weight, critical temperature, critical pressure, and critical volume (or critical compressibility).The acentric factor is said to be a measure of the non-sphericity (centricity) of molecules. As it increases, the vapor curve is "pulled" down, resulting in higher boiling points. It is defined as: . where For many monatomic fluids (en)
rdfs:label
  • Azentrischer Faktor (de)
  • Acentric factor (en)
  • Factor acéntrico (es)
  • Fattore acentrico (it)
  • Facteur acentrique (fr)
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