Acentric factor (original) (raw)
El factor acèntric és un paràmetre necessari per calcular el factor de compressibilitat d'un gas, mesura la desviació del gas respecte a gasos com el criptó, xenó i argó (també anomenats fluids simples), pels quals el factor acèntric pren el valor de zero. El factor acèntric mesura l'esfericitat de la molècula, és a dir, dona un nombre que representa totes les forces presents en ella, no només les del centre, sinó les de tota la molècula.
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| dbo:abstract | El factor acèntric és un paràmetre necessari per calcular el factor de compressibilitat d'un gas, mesura la desviació del gas respecte a gasos com el criptó, xenó i argó (també anomenats fluids simples), pels quals el factor acèntric pren el valor de zero. El factor acèntric mesura l'esfericitat de la molècula, és a dir, dona un nombre que representa totes les forces presents en ella, no només les del centre, sinó les de tota la molècula. (ca) The acentric factor ω is a conceptual number introduced by Kenneth Pitzer in 1955, proven to be useful in the description of fluids. It has become a standard for the phase characterization of single & pure components, along with other state description parameters such as molecular weight, critical temperature, critical pressure, and critical volume (or critical compressibility). Pitzer defined ω from the relationship where is the reduced saturation vapor pressure and is the reduced temperature. 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. For many monatomic fluids, is close to 0.1, which leads to . In many cases, lies above the boiling temperature of liquids at atmosphere pressure. Values of ω can be determined for any fluid from accurate experimental vapor pressure data. The definition of ω gives values which are close to zero for the noble gases argon, krypton, and xenon. is also very close to zero for molecules which are nearly spherical. Values of ω ≤ -1 correspond to vapor pressures above the critical pressure, and are non-physical. The acentric factor can be predicted analytically from some equations of state. For example, it can be easily shown from the above definition that a van der Waals fluid has an acentric factor of about −0.302024, which if applied to a real system would indicate a small, ultra-spherical molecule. (en) El factor acéntrico se define como un parámetro necesario para calcular el factor de compresibilidad de un gas, este 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) Le facteur acentrique est un nombre conceptuel introduit par Kenneth Pitzer en 1955 et couramment utilisé dans la description de la matière en thermodynamique, notamment pour la caractérisation de composés purs (voir par exemple son usage dans les équations d'état cubiques). (fr) In termodinamica, il fattore acentrico (comunemente indicato con ) è un fattore originariamente proposto da nel 1955 come parametro in un'equazione per il fattore di comprimibilità.Insieme ad altre proprietà, come massa molecolare, pressione critica, temperatura critica e , il fattore acentrico è divenuto uno standard per la corretta caratterizzazione di qualsiasi sostanza pura. Pitzer giunse alla sua formulazione in seguito all'analisi delle curve di tensione di vapore di alcune sostanze pure. Esso viene utilizzato per migliorare la stima nel caso dell'utilizzo dell'equazione degli stati corrispondenti e del teorema degli stati corrispondenti. (it) |
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| rdfs:comment | El factor acèntric és un paràmetre necessari per calcular el factor de compressibilitat d'un gas, mesura la desviació del gas respecte a gasos com el criptó, xenó i argó (també anomenats fluids simples), pels quals el factor acèntric pren el valor de zero. El factor acèntric mesura l'esfericitat de la molècula, és a dir, dona un nombre que representa totes les forces presents en ella, no només les del centre, sinó les de tota la molècula. (ca) El factor acéntrico se define como un parámetro necesario para calcular el factor de compresibilidad de un gas, este 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) Le facteur acentrique est un nombre conceptuel introduit par Kenneth Pitzer en 1955 et couramment utilisé dans la description de la matière en thermodynamique, notamment pour la caractérisation de composés purs (voir par exemple son usage dans les équations d'état cubiques). (fr) The acentric factor ω is a conceptual number introduced by Kenneth Pitzer in 1955, proven to be useful in the description of fluids. It has become a standard for the phase characterization of single & pure components, along with other state description parameters such as molecular weight, critical temperature, critical pressure, and critical volume (or critical compressibility). Pitzer defined ω from the relationship where is the reduced saturation vapor pressure and is the reduced temperature. (en) In termodinamica, il fattore acentrico (comunemente indicato con ) è un fattore originariamente proposto da nel 1955 come parametro in un'equazione per il fattore di comprimibilità.Insieme ad altre proprietà, come massa molecolare, pressione critica, temperatura critica e , il fattore acentrico è divenuto uno standard per la corretta caratterizzazione di qualsiasi sostanza pura. Pitzer giunse alla sua formulazione in seguito all'analisi delle curve di tensione di vapore di alcune sostanze pure. (it) |
| rdfs:label | Factor acèntric (ca) Azentrischer Faktor (de) Acentric factor (en) Factor acéntrico (es) Fattore acentrico (it) Facteur acentrique (fr) |
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