{"id":5753,"date":"2026-10-14T23:06:39","date_gmt":"2026-10-14T20:06:39","guid":{"rendered":"https:\/\/wpcalc.com\/fr\/convertisseurs\/convertisseur-ppm-mg-m3-gaz\/"},"modified":"2026-10-14T23:06:39","modified_gmt":"2026-10-14T20:06:39","slug":"convertisseur-ppm-mg-m3-gaz","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/fr\/convertisseurs\/convertisseur-ppm-mg-m3-gaz\/","title":{"rendered":"Convertisseur de ppm en mg\/m\u00b3 pour gaz"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Convertir entre ppm et mg\/m\u00b3<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"5753\" data-favorite-title=\"Gaz : ppm en mg\/m\u00b3\" data-favorite-url=\"https:\/\/wpcalc.com\/fr\/convertisseurs\/convertisseur-ppm-mg-m3-gaz\/\" data-favorite-excerpt=\"Convertissez les concentrations de gaz entre ppm (volume) et mg\/m\u00b3 (masse) gr\u00e2ce \u00e0 la loi des gaz parfaits. Saisissez la concentration, la masse molaire du gaz, la temp\u00e9rature et la pression pour obtenir instantan\u00e9ment des r\u00e9sultats en mg\/m\u00b3, ppm et \u00b5g\/m\u00b3.\" aria-label=\"Ajouter aux favoris\" data-favorite-icon=\"icon icon-chemistry\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/fr\/convertisseurs\/convertisseur-ppm-mg-m3-gaz\/\" method=\"POST\" class=\"calculator\" id=\"calculator-5753\" data-post=\"5753\"><fieldset class=\"fieldset-input is-1\"><legend class=\"sr-only\">Champs de saisie<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">Concentration du gaz<\/label><div class=\"term\">C<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"concentration_du_gaz\" id=\"field-1\" aria-describedby=\"calc-info-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 100\" min=\"0\" value=\"100\"\/><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"unit\" aria-label=\"Unit\u00e9\"><option value=\"ppm\" selected>ppm<\/option><option value=\"mgm3\">mg\/m\u00b3<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-1\">Valeur de la concentration dans l&#039;air que vous connaissez<\/small><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-3\">Masse molaire<\/label><div class=\"term\">M<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"masse_molaire\" id=\"field-3\" aria-describedby=\"calc-unit-3 calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0.1\" value=\"44.01\"\/><div class=\"unit\" id=\"calc-unit-3\">g\/mol<\/div><small id=\"calc-info-3\">Masse molaire du gaz, par ex. 44,01 pour le CO\u2082, 28,97 pour l&#039;air<\/small><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-4\">Temp\u00e9rature<\/label><div class=\"term\">T<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"number\" name=\"temprature\" id=\"field-4\" aria-describedby=\"calc-info-4\" step=\"any\" value=\"25\"\/><div class=\"grid grid-cols-1\"><select id=\"field-5\" name=\"unit\" aria-label=\"Unit\u00e9\"><option value=\"c\" selected>\u00b0C<\/option><option value=\"f\">\u00b0F<\/option><option value=\"k\">K<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-4\">Temp\u00e9rature du gaz<\/small><\/div><div class=\"field has-term\" id=\"input-4\"><label for=\"field-6\">Pression<\/label><div class=\"term\">P<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"pression\" id=\"field-6\" aria-describedby=\"calc-info-6\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0.001\" value=\"1\"\/><div class=\"grid grid-cols-1\"><select id=\"field-7\" name=\"unit\" aria-label=\"Unit\u00e9\"><option value=\"atm\" selected>atm<\/option><option value=\"kpa\">kPa<\/option><option value=\"bar\">bar<\/option><option value=\"mmhg\">mmHg<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-6\">Pression atmosph\u00e9rique<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Recalculer\" id=\"calculate-button\" data-post=\"5753\">Calculer<\/button><button type=\"reset\">R\u00e9initialiser<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calculer automatiquement<\/label><small>Si activ\u00e9, le r\u00e9sultat se met \u00e0 jour automatiquement d\u00e8s que vous modifiez une valeur.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Concentration \u00e9quivalente<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Concentration en mg\/m\u00b3<\/span><\/span><span class=\"field-value\" id=\"result-1\" data-unit=\"mg\/m\u00b3\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-2\"><span class=\"field-title\"><span>Concentration en ppm<\/span><\/span><span class=\"field-value\" id=\"result-2\" data-unit=\"ppm\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-3\"><span class=\"field-title\"><span>Concentration en \u00b5g\/m\u00b3<\/span><\/span><span class=\"field-value\" id=\"result-3\" data-unit=\"\u00b5g\/m\u00b3\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copier le lien vers ce calcul<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Laisser un commentaire<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"5753\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">Que pensez-vous de ce r\u00e9sultat\u00a0?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">J\u2019aime <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">Utile <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confus <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">D\u00e9\u00e7u <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Inexact <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>Formule de conversion de ppm en mg\/m\u00b3 pour les gaz<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">Formule<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[\nC_{mg\/m^3} = \\frac{C_{ppm} \\cdot M \\cdot P}{R \\cdot T}\n\\qquad \\text{et} \\qquad\nC_{ppm} = \\frac{C_{mg\/m^3} \\cdot R \\cdot T}{M \\cdot P}\n\\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>O\u00f9&nbsp;:<\/strong><\/p>\n<ul>\n<li>\\(C_{ppm}\\) \u2014 concentration en parties par million en volume (ppm)<\/li>\n<li>\\(C_{mg\/m^3}\\) \u2014 concentration en milligrammes par m\u00e8tre cube (mg\/m\u00b3)<\/li>\n<li>\\(M\\) \u2014 masse mol\u00e9culaire (masse molaire) du gaz, en g\/mol<\/li>\n<li>\\(P\\) \u2014 pression en atmosph\u00e8res (atm)<\/li>\n<li>\\(T\\) \u2014 temp\u00e9rature absolue en kelvins (K)<\/li>\n<li>\\(R = 0.082057\\) \u2014 constante des gaz parfaits en L\u00b7atm\/(mol\u00b7K)<\/li>\n<\/ul>\n<p>Ces formules permettent de passer d'une concentration exprim\u00e9e en volume (ppm) \u00e0 une concentration exprim\u00e9e en masse (mg\/m\u00b3), en s'appuyant sur la loi des gaz parfaits. \u00c0 25 \u00b0C et 1 atm, le facteur \\(R \\cdot T\\) vaut 24,45, d'o\u00f9 la r\u00e8gle bien connue \\(mg\/m^3 = ppm \\times M \/ 24.45\\).<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-2\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>Exemple de calcul : de ppm \u00e0 mg\/m\u00b3 pour un gaz<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Exemple&nbsp;:<\/strong> convertir 100 ppm de dioxyde de carbone (CO\u2082) en mg\/m\u00b3 \u00e0 25 \u00b0C et 1 atm. La masse mol\u00e9culaire du CO\u2082 est de 44,01 g\/mol.<\/p>\n<p>\\[<br \/>\nT = 25 + 273.15 = 298.15\\ \\text{K}<br \/>\n\\]<\/p>\n<p>\\[<br \/>\nC_{mg\/m^3} = \\frac{100 \\times 44.01 \\times 1}{0.082057 \\times 298.15}<br \/>\n= \\frac{4401}{24.4686} \\approx 179.86<br \/>\n\\]<\/p>\n<p><strong>R\u00e9sultat&nbsp;:<\/strong> 100 ppm de CO\u2082 \u00e0 25 \u00b0C et 1 atm \u2248 179,86 mg\/m\u00b3 (soit environ 179&nbsp;861 \u00b5g\/m\u00b3).<\/p>\n<p>\n\r\n<\/section>\n<h2>Comment utiliser le calculateur<\/h2>\n<ol>\n<li>Saisissez la <strong>concentration de gaz<\/strong> que vous connaissez et choisissez son unit\u00e9 \u2014 <em>ppm<\/em> ou <em>mg\/m\u00b3<\/em> \u2014 dans le menu d\u00e9roulant plac\u00e9 \u00e0 c\u00f4t\u00e9 de la valeur.<\/li>\n<li>Saisissez la <strong>masse mol\u00e9culaire<\/strong> du gaz en g\/mol (par exemple 44,01 pour le CO\u2082, 28,97 pour l'air, 64,07 pour le SO\u2082).<\/li>\n<li>Saisissez la <strong>temp\u00e9rature<\/strong> du gaz et s\u00e9lectionnez \u00b0C, \u00b0F ou K.<\/li>\n<li>Saisissez la <strong>pression<\/strong> et s\u00e9lectionnez atm, kPa, bar ou mmHg.<\/li>\n<li>Lisez les r\u00e9sultats&nbsp;: la concentration \u00e9quivalente s'affiche en <strong>mg\/m\u00b3<\/strong>, en <strong>ppm<\/strong> et en <strong>\u00b5g\/m\u00b3<\/strong>.<\/li>\n<\/ol>\n<h2>Ce que signifient les ppm et les mg\/m\u00b3<\/h2>\n<p>Les concentrations de gaz s'expriment de deux mani\u00e8res fondamentalement diff\u00e9rentes. Le <strong>ppm (partie par million)<\/strong> est une unit\u00e9 volumique : il indique combien de volumes de gaz sont pr\u00e9sents par million de volumes du m\u00e9lange d'air. Le <strong>mg\/m\u00b3<\/strong> est une unit\u00e9 massique&nbsp;: il indique combien de milligrammes de la substance sont pr\u00e9sents dans chaque m\u00e8tre cube d'air. Valeurs limites d'exposition professionnelle, mesurages en milieu de travail et normes de qualit\u00e9 de l'air alternent entre les deux syst\u00e8mes, d'o\u00f9 le besoin fr\u00e9quent d'une conversion fiable.<\/p>\n<p>La conversion d\u00e9pend du gaz lui-m\u00eame. Un ppm d'une mol\u00e9cule lourde comme le dioxyde de soufre (M = 64,07 g\/mol) correspond \u00e0 plus de deux fois plus de mg\/m\u00b3 qu'un ppm d'une mol\u00e9cule l\u00e9g\u00e8re comme le m\u00e9thane (M = 16,04 g\/mol). C'est pourquoi le calculateur demande la masse mol\u00e9culaire&nbsp;: il n'existe pas de facteur de conversion universel unique.<\/p>\n<p>La temp\u00e9rature et la pression comptent aussi. Comme la conversion repose sur la loi des gaz parfaits, le volume occup\u00e9 par une mole de gaz diminue \u00e0 basse temp\u00e9rature ou \u00e0 haute pression, si bien qu'une m\u00eame valeur en ppm correspond \u00e0 une concentration en mg\/m\u00b3 plus \u00e9lev\u00e9e. Si vous laissez les valeurs par d\u00e9faut (25 \u00b0C, 1 atm), les r\u00e9sultats correspondent au diviseur standard de 24,45 utilis\u00e9 dans la plupart des r\u00e9f\u00e9rences d'hygi\u00e8ne professionnelle. Pour voir comment la temp\u00e9rature et la pression fa\u00e7onnent les propri\u00e9t\u00e9s de l'air lui-m\u00eame, essayez le <a href=\"https:\/\/wpcalc.com\/fr\/convertisseurs\/calculateur-densite-air\/\">calculateur de densit\u00e9 de l'air<\/a>.<\/p>\n<h2>Hypoth\u00e8ses et limites<\/h2>\n<ul>\n<li><strong>Comportement de gaz parfait.<\/strong> Le calcul suppose que le m\u00e9lange gazeux suit la loi des gaz parfaits. C'est exact pour des concentrations \u00e0 l'\u00e9tat de traces aux temp\u00e9ratures et pressions ordinaires ; des \u00e9carts apparaissent \u00e0 tr\u00e8s haute pression ou \u00e0 basse temp\u00e9rature.<\/li>\n<li><strong>ppm en volume.<\/strong> Le calculateur convertit les ppm<sub>v<\/sub> (rapport volumique). Ne l'utilisez pas pour les ppm massiques (ppm<sub>w<\/sub>) de liquides ou de substances dissoutes \u2014 pour cela, le <a href=\"https:\/\/wpcalc.com\/fr\/convertisseurs\/convertisseur-ppm-pourcent-mg-l\/\">convertisseur ppm<\/a> (ppm vers pourcent et mg\/L) est l'outil qu'il vous faut.<\/li>\n<li><strong>Gaz sec.<\/strong> L'humidit\u00e9 n'est pas prise en compte. Une humidit\u00e9 \u00e9lev\u00e9e modifie l\u00e9g\u00e8rement le volume molaire r\u00e9el de l'air.<\/li>\n<li><strong>Conditions de r\u00e9f\u00e9rence.<\/strong> Lorsque vous comparez avec des valeurs limites r\u00e9glementaires ou des donn\u00e9es publi\u00e9es, v\u00e9rifiez si elles se r\u00e9f\u00e8rent \u00e0 25 \u00b0C (convention OSHA et pratique australienne) ou \u00e0 20 \u00b0C\/101,3 kPa (courant en Europe) et r\u00e9glez la temp\u00e9rature en cons\u00e9quence.<\/li>\n<li><strong>Exactitude de M.<\/strong> Utilisez la bonne masse molaire du gaz pur ou du m\u00e9lange ; une masse mol\u00e9culaire erron\u00e9e fausse le r\u00e9sultat proportionnellement.<\/li>\n<\/ul>\n<h2>Aide-m\u00e9moire : gaz courants \u00e0 25 \u00b0C et 1 atm<\/h2>\n<table>\n<thead>\n<tr>\n<th>Gaz<\/th>\n<th>Masse mol\u00e9culaire (g\/mol)<\/th>\n<th>1 ppm \u00e9quivaut \u00e0 (mg\/m\u00b3)<\/th>\n<th>1 mg\/m\u00b3 \u00e9quivaut \u00e0 (ppm)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Air<\/td>\n<td>28,97<\/td>\n<td>1,18<\/td>\n<td>0,845<\/td>\n<\/tr>\n<tr>\n<td>Monoxyde de carbone (CO)<\/td>\n<td>28,01<\/td>\n<td>1,14<\/td>\n<td>0,873<\/td>\n<\/tr>\n<tr>\n<td>Dioxyde de carbone (CO\u2082)<\/td>\n<td>44,01<\/td>\n<td>1,80<\/td>\n<td>0,556<\/td>\n<\/tr>\n<tr>\n<td>Dioxyde de soufre (SO\u2082)<\/td>\n<td>64,07<\/td>\n<td>2,62<\/td>\n<td>0,382<\/td>\n<\/tr>\n<tr>\n<td>Dioxyde d'azote (NO\u2082)<\/td>\n<td>46,01<\/td>\n<td>1,88<\/td>\n<td>0,532<\/td>\n<\/tr>\n<tr>\n<td>Ozone (O\u2083)<\/td>\n<td>48,00<\/td>\n<td>1,96<\/td>\n<td>0,510<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Les valeurs ci-dessus ne valent qu'\u00e0 25 \u00b0C et 1 atm. Dans d'autres conditions, effectuez toujours la conversion compl\u00e8te avec la temp\u00e9rature et la pression r\u00e9elles \u2014 ou explorez d'autres conversions d'unit\u00e9s comme le <a href=\"https:\/\/wpcalc.com\/fr\/convertisseurs\/convertisseur-unites-masse-volumique\/\">convertisseur de masse volumique<\/a> ou le <a href=\"https:\/\/wpcalc.com\/en\/converters\/pressure-altitude-calculator\/\">calculateur d'altitude-pression<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Convertissez les concentrations de gaz entre ppm (volume) et mg\/m\u00b3 (masse) gr\u00e2ce \u00e0 la loi des gaz parfaits. Saisissez la concentration, la masse molaire du gaz, la temp\u00e9rature et la pression pour obtenir instantan\u00e9ment des r\u00e9sultats en mg\/m\u00b3, ppm et \u00b5g\/m\u00b3.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[15],"tags":[60],"class_list":["post-5753","post","type-post","status-publish","format-standard","hentry","category-convertisseurs","tag-unites-chimie"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/posts\/5753","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/comments?post=5753"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/posts\/5753\/revisions"}],"predecessor-version":[{"id":6057,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/posts\/5753\/revisions\/6057"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/media?parent=5753"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/categories?post=5753"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/tags?post=5753"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}