<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2011000200005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Ecuación de estado cúbica para un fluido simple]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guevara-Rodríguez]]></surname>
<given-names><![CDATA[F. de J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Mexicano del Petróleo Programa de Ingeniería Molecular ]]></institution>
<addr-line><![CDATA[México D.F]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2011</year>
</pub-date>
<volume>57</volume>
<numero>2</numero>
<fpage>125</fpage>
<lpage>132</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2011000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2011000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2011000200005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este trabajo se presenta un método para construir la ecuación de estado cúbica de una substancia pura. La ecuación de estado se determina con los valores de la presión P, el volumen molar v y la temperatura T en dos estados, a saber, el punto crítico y el vapor saturado a temperatura T/Tc = 0.7 (en donde Tc es la temperatura crítica). La ecuación resultante es única para cada substancia y, en general, diferente a otras ecuaciones de estado cúbicas conocidas en la literatura.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this work, a method to build the Cubic Equation of State of a pure substance is presented. The Equation of State is determined with the values of the pressure P, the molar volume v, and the temperature T in two states, namely, the critical point and the saturated vapor at temperature T/Tc = 0.7 (where Tc is the critical temperature). The resulting Equation is unique for each substance and, in general, different to other known Cubic Equation of State in the literature.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ecuación cúbica de estado]]></kwd>
<kwd lng="en"><![CDATA[Cubic equation of state]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Ecuaci&oacute;n de estado c&uacute;bica para un fluido simple</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>F. de J. Guevara&#150;Rodr&iacute;guez</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Programa de Ingenier&iacute;a Molecular, Instituto Mexicano del Petr&oacute;leo, Eje Central L&aacute;zaro C&aacute;rdenas 152, M&eacute;xico, D.F., 07730, M&eacute;xico, </i>e&#150;mail: <a href="mailto:fguevara@imp.mx">fguevara@imp.mx</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 5 de abril de 2010    <br> Aceptado el 17 de febrero de 2011</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">En este trabajo se presenta un m&eacute;todo para construir la ecuaci&oacute;n de estado c&uacute;bica de una substancia pura. La ecuaci&oacute;n de estado se determina con los valores de la presi&oacute;n <i>P, </i>el volumen molar <i>v </i>y la temperatura <i>T </i>en dos estados, a saber, el punto cr&iacute;tico y el vapor saturado a temperatura <i>T/T<sub>c</sub> </i>= 0.7 (en donde <i>T<sub>c</sub> </i>es la temperatura cr&iacute;tica). La ecuaci&oacute;n resultante es &uacute;nica para cada substancia y, en general, diferente a otras ecuaciones de estado c&uacute;bicas conocidas en la literatura.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Ecuaci&oacute;n c&uacute;bica de estado.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">In this work, a method to build the Cubic Equation of State of a pure substance is presented. The Equation of State is determined with the values of the pressure <i>P, </i>the molar volume <i>v, </i>and the temperature <i>T </i>in two states, namely, the critical point and the saturated vapor at temperature <i>T/T<sub>c</sub> </i>= 0.7 (where <i>T<sub>c</sub> </i>is the critical temperature). The resulting Equation is unique for each substance and, in general, different to other known Cubic Equation of State in the literature.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Cubic equation of state.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 64.10.+h</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v57n2/v57n2a5.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>     <p align="justify"><font face="verdana" size="2">El autor agradece al Instituto Mexicano del Petr&oacute;leo el apoyo a este trabajo a trav&eacute;s de los proyectos D.00406 y D.00264. Dedicado a Debi.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Bibliograf&iacute;a</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. J.S. 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