<?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>0187-893X</journal-id>
<journal-title><![CDATA[Educación química]]></journal-title>
<abbrev-journal-title><![CDATA[Educ. quím]]></abbrev-journal-title>
<issn>0187-893X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Química]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-893X2025000100082</article-id>
<article-id pub-id-type="doi">10.22201/fq.18708404e.2025.1.88260</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Dimensional Analysis in Chemistry Textbooks 1900-2020 and an Algebraic Alternative]]></article-title>
<article-title xml:lang="es"><![CDATA[Análisis dimensional en los libros de texto de química de 1900-2020 y una alternativa algebraica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García García]]></surname>
<given-names><![CDATA[José Luís]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Pedagógica Nacional  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>36</volume>
<numero>1</numero>
<fpage>82</fpage>
<lpage>108</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-893X2025000100082&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-893X2025000100082&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-893X2025000100082&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The chapter on units and measurements is practically indispensable in modern chemistry textbooks, and within it, the factor-label method has become synonymous with dimensional analysis. In this paper, we aim to investigate whether this necessity has been consistent throughout the history of general chemistry textbooks. We will also demonstrate that equating the concept of dimensional analysis with the factor-label technique is incorrect, as an algebraic alternative exists. To determine the relationship of the units and measurements chapter with the textbook, we examined 140 books from the 1900s to the present day, finding that this chapter and its algorithms were gradually introduced during the transition from the 1950s to the 1970s, accompanied by other fundamental changes in the texts. Additionally, we present an alternative to the factor-label method, called algebraic substitution, which offers a greater diversity of techniques to expedite specific calculations. However, mastering all these techniques requires time and skill. This shows that the factor-label method is not the only option for performing dimensional analysis. Therefore, we must not confuse a technique or algorithm with the underlying philosophical foundation of dimensional analysis.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El capítulo sobre unidades y mediciones es prácticamente indispensable en los libros de texto de química moderna, y dentro de él, el método de factor de conversión se ha convertido en sinónimo de análisis dimensional. En este artículo, nuestro objetivo es investigar si esta necesidad ha sido consistente a lo largo de la historia de los libros de texto de química general. También demostraremos que equiparar el concepto de análisis dimensional con la técnica de factor-etiqueta es incorrecto, ya que existe una alternativa algebraica. Para determinar la relación del capítulo sobre unidades y mediciones con el libro de texto, examinamos 140 libros desde la década de 1900 hasta la actualidad, encontrando que este capítulo y sus algoritmos fueron gradualmente introducidos durante la transición de las décadas de 1950 a 1970, acompañados de otros cambios fundamentales en los textos. Además, presentamos una alternativa al método de factor de conversión, llamada sustitución algebraica, que ofrece una mayor diversidad de técnicas para agilizar cálculos específicos. Sin embargo, dominar todas estas técnicas requiere tiempo y habilidad. Esto demuestra que el método de factor de conversión no es la única opción para realizar análisis dimensional. Por lo tanto, no debemos confundir una técnica o algoritmo con la base filosófica subyacente del análisis dimensional.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[dimensional analysis]]></kwd>
<kwd lng="en"><![CDATA[factor-label method]]></kwd>
<kwd lng="en"><![CDATA[units and measurements]]></kwd>
<kwd lng="en"><![CDATA[textbooks]]></kwd>
<kwd lng="en"><![CDATA[algorithms]]></kwd>
<kwd lng="es"><![CDATA[análisis dimensional]]></kwd>
<kwd lng="es"><![CDATA[método de factor-etiqueta]]></kwd>
<kwd lng="es"><![CDATA[unidades y mediciones]]></kwd>
<kwd lng="es"><![CDATA[libros de texto]]></kwd>
<kwd lng="es"><![CDATA[algoritmos]]></kwd>
</kwd-group>
</article-meta>
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