{"id":66774,"date":"2026-10-13T08:58:57","date_gmt":"2026-10-13T05:58:57","guid":{"rendered":"https:\/\/wpcalc.com\/en\/?p=66774"},"modified":"2026-10-13T08:58:57","modified_gmt":"2026-10-13T05:58:57","slug":"gas-ppm-to-mg-m%c2%b3-converter","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/converters\/gas-ppm-to-mg-m%c2%b3-converter\/","title":{"rendered":"Gas PPM to mg\/m\u00b3 Converter"},"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\">Convert Between ppm and mg\/m\u00b3<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"66774\" data-favorite-title=\"Gas PPM to mg\/m\u00b3\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/converters\/gas-ppm-to-mg-m%c2%b3-converter\/\" data-favorite-excerpt=\"Convert gas concentrations between ppm (volume) and mg\/m\u00b3 (mass) using the ideal gas law. Enter the concentration, the gas molar mass, temperature and pressure to get instant results in mg\/m\u00b3, ppm and \u00b5g\/m\u00b3.\" aria-label=\"Add to Favorites\" 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\/en\/converters\/gas-ppm-to-mg-m%c2%b3-converter\/\" method=\"POST\" class=\"calculator\" id=\"calculator-66774\" data-post=\"66774\"><fieldset class=\"fieldset-input is-1\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">Gas concentration<\/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=\"gas_concentration\" 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\"><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\">Value of the airborne concentration you know<\/small><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-3\">Molecular mass<\/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=\"molecular_mass\" 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\">Molar mass of the gas, e.g. 44.01 for CO\u2082, 28.97 for air<\/small><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-4\">Temperature<\/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=\"temperature\" 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\"><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\">Gas temperature<\/small><\/div><div class=\"field has-term\" id=\"input-4\"><label for=\"field-6\">Pressure<\/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=\"pressure\" 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\"><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\">Atmospheric pressure<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"66774\">Calculate<\/button><button type=\"reset\">Reset<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calculate automatically<\/label><small>If enabled, the result will update automatically when you change any value.<\/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> Equivalent Concentration<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Concentration in 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=\"Copy Result\" aria-label=\"Copy Result\"><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 in ppm<\/span><\/span><span class=\"field-value\" id=\"result-2\" data-unit=\"ppm\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><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 in \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=\"Copy Result\" aria-label=\"Copy Result\"><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\">Copy link to this calculation<\/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>Leave a Comment<\/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=\"66774\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">How did this result make you feel?<\/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\">Like <\/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\">Helpful <\/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\">Confused <\/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\">Disappointed <\/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\">Inaccurate <\/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>Gas PPM to mg\/m\u00b3 Converter Formula<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">Formula<\/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{and} \\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>Where:<\/strong><\/p>\n<ul>\n<li>\\(C_{ppm}\\) \u2014 concentration in parts per million by volume (ppm)<\/li>\n<li>\\(C_{mg\/m^3}\\) \u2014 concentration in milligrams per cubic metre (mg\/m\u00b3)<\/li>\n<li>\\(M\\) \u2014 molecular mass (molar mass) of the gas, in g\/mol<\/li>\n<li>\\(P\\) \u2014 pressure in atmospheres (atm)<\/li>\n<li>\\(T\\) \u2014 absolute temperature in kelvin (K)<\/li>\n<li>\\(R = 0.082057\\) \u2014 ideal gas constant in L\u00b7atm\/(mol\u00b7K)<\/li>\n<\/ul>\n<p>These formulas convert between a volume-based concentration (ppm) and a mass-based concentration (mg\/m\u00b3) using the ideal gas law. At 25 \u00b0C and 1 atm the factor \\(R \\cdot T\\) equals 24.45, which is the basis of the familiar rule \\(mg\/m^3 = ppm \\times M \/ 24.45\\).<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-459\">.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>Gas PPM to mg\/m\u00b3 \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> convert 100 ppm of carbon dioxide (CO\u2082) to mg\/m\u00b3 at 25 \u00b0C and 1 atm. The molecular mass of CO\u2082 is 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>Result:<\/strong> 100 ppm of CO\u2082 at 25 \u00b0C and 1 atm \u2248 179.86 mg\/m\u00b3 (about 179,861 \u00b5g\/m\u00b3).<\/p>\n<p>\n\r\n<\/section>\n<h2>How to use the calculator<\/h2>\n<ol>\n<li>Enter the <strong>Gas concentration<\/strong> you know and choose its unit \u2014 <em>ppm<\/em> or <em>mg\/m\u00b3<\/em> \u2014 from the dropdown next to the value.<\/li>\n<li>Enter the <strong>Molecular mass<\/strong> of the gas in g\/mol (e.g. 44.01 for CO\u2082, 28.97 for air, 64.07 for SO\u2082).<\/li>\n<li>Enter the <strong>Temperature<\/strong> of the gas and select \u00b0C, \u00b0F or K.<\/li>\n<li>Enter the <strong>Pressure<\/strong> and select atm, kPa, bar or mmHg.<\/li>\n<li>Read the results: the equivalent concentration is shown in <strong>mg\/m\u00b3<\/strong>, <strong>ppm<\/strong> and <strong>\u00b5g\/m\u00b3<\/strong>.<\/li>\n<\/ol>\n<h2>What ppm and mg\/m\u00b3 mean<\/h2>\n<p>Gas concentrations are expressed in two fundamentally different ways. <strong>ppm (parts per million)<\/strong> is a volume-based unit: it tells you how many volumes of gas are present per million volumes of the air mixture. <strong>mg\/m\u00b3<\/strong> is a mass-based unit: it tells you how many milligrams of the substance are present in each cubic metre of air. Occupational exposure limits, workplace measurements and air-quality standards switch between the two systems, so a reliable conversion is often needed.<\/p>\n<p>The conversion depends on the gas itself. One ppm of a heavy molecule such as sulfur dioxide (M = 64.07 g\/mol) corresponds to more than twice as many mg\/m\u00b3 as one ppm of a light molecule such as methane (M = 16.04 g\/mol). That is why the calculator asks for the molecular mass \u2014 there is no single universal conversion factor.<\/p>\n<p>Temperature and pressure also matter. Because the conversion is based on the ideal gas law, the volume occupied by a mole of gas shrinks at low temperatures or high pressures, so the same ppm value corresponds to a higher mg\/m\u00b3 concentration. If you leave the default values (25 \u00b0C, 1 atm), the results match the standard 24.45 divisor used in most occupational hygiene references. To see how temperature and pressure shape the properties of air itself, try the <a href=\"https:\/\/wpcalc.com\/en\/converters\/air-density-calculator\/\">Air Density calculator<\/a>.<\/p>\n<h2>Assumptions and limitations<\/h2>\n<ul>\n<li><strong>Ideal gas behaviour.<\/strong> The calculation assumes the gas mixture follows the ideal gas law. This is accurate for trace concentrations at ordinary temperatures and pressures; deviations appear at very high pressures or low temperatures.<\/li>\n<li><strong>ppm by volume.<\/strong> The calculator converts ppm<sub>v<\/sub> (volume ratio). Do not use it for ppm by weight (ppm<sub>w<\/sub>) of liquids or dissolved substances \u2014 for those, the <a href=\"https:\/\/wpcalc.com\/en\/converters\/ppm-to-percent-mg-l-converter\/\">PPM Converter<\/a> (ppm to percent and mg\/L) is the right tool.<\/li>\n<li><strong>Dry gas.<\/strong> Humidity is not taken into account. High humidity slightly changes the actual molar volume of air.<\/li>\n<li><strong>Reference conditions matter.<\/strong> When comparing with legal limits or published data, check whether they refer to 25 \u00b0C (as in OSHA and Australian practice) or 20 \u00b0C\/101.3 kPa (common in Europe) and set the temperature accordingly.<\/li>\n<li><strong>Accuracy of M.<\/strong> Use the correct molar mass of the pure gas or mixture; a wrong molecular mass shifts the result proportionally.<\/li>\n<\/ul>\n<h2>Quick reference: common gases at 25 \u00b0C and 1 atm<\/h2>\n<table>\n<thead>\n<tr>\n<th>Gas<\/th>\n<th>Molecular mass (g\/mol)<\/th>\n<th>1 ppm equals (mg\/m\u00b3)<\/th>\n<th>1 mg\/m\u00b3 equals (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>Carbon monoxide (CO)<\/td>\n<td>28.01<\/td>\n<td>1.14<\/td>\n<td>0.873<\/td>\n<\/tr>\n<tr>\n<td>Carbon dioxide (CO\u2082)<\/td>\n<td>44.01<\/td>\n<td>1.80<\/td>\n<td>0.556<\/td>\n<\/tr>\n<tr>\n<td>Sulfur dioxide (SO\u2082)<\/td>\n<td>64.07<\/td>\n<td>2.62<\/td>\n<td>0.382<\/td>\n<\/tr>\n<tr>\n<td>Nitrogen dioxide (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>The values above hold only at 25 \u00b0C and 1 atm. At other conditions, always run the full conversion with the actual temperature and pressure \u2014 or explore other unit conversions such as the <a href=\"https:\/\/wpcalc.com\/en\/converters\/density-units-converter\/\">Density Converter<\/a> or the <a href=\"https:\/\/wpcalc.com\/en\/converters\/pressure-altitude-calculator\/\">Pressure Altitude calculator<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Convert gas concentrations between ppm (volume) and mg\/m\u00b3 (mass) using the ideal gas law. Enter the concentration, the gas molar mass, temperature and pressure to get instant results in mg\/m\u00b3, ppm and \u00b5g\/m\u00b3.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3],"tags":[17],"class_list":["post-66774","post","type-post","status-publish","format-standard","hentry","category-converters","tag-chemistry-units"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66774","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/comments?post=66774"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66774\/revisions"}],"predecessor-version":[{"id":66775,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66774\/revisions\/66775"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=66774"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=66774"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=66774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}