{"id":2117,"date":"2026-10-14T21:05:36","date_gmt":"2026-10-14T20:05:36","guid":{"rendered":"https:\/\/wpcalc.com\/pt\/quimica\/calculadora-densidade-de-gases\/"},"modified":"2026-10-14T21:05:36","modified_gmt":"2026-10-14T20:05:36","slug":"calculadora-densidade-de-gases","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/pt\/quimica\/calculadora-densidade-de-gases\/","title":{"rendered":"Calculadora de densidade de gases"},"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\">Calcule a densidade de um g\u00e1s pela press\u00e3o e temperatura<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"2117\" data-favorite-title=\"Densidade de gases\" data-favorite-url=\"https:\/\/wpcalc.com\/pt\/quimica\/calculadora-densidade-de-gases\/\" data-favorite-excerpt=\"Calcule a densidade de qualquer g\u00e1s a partir da press\u00e3o absoluta, da temperatura e da massa molar usando a lei dos gases ideais. Informe os valores em kPa, Pa, bar, atm, psi ou mmHg e em \u00b0C, K ou \u00b0F \u2014 o resultado \u00e9 exibido em kg\/m\u00b3, g\/L e lb\/ft\u00b3.\" aria-label=\"Adicionar aos favoritos\" data-favorite-icon=\"icon icon-wind-2\">\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\/pt\/quimica\/calculadora-densidade-de-gases\/\" method=\"POST\" class=\"calculator\" id=\"calculator-2117\" data-post=\"2117\"><fieldset class=\"fieldset-input is-2\"><legend class=\"sr-only\">Campos de entrada<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">Press\u00e3o (P)<\/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=\"presso_p\" id=\"field-1\" aria-describedby=\"calc-info-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 101.325\" min=\"0\" value=\"101.325\"\/><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"kPa\" selected>kPa<\/option><option value=\"Pa\">Pa<\/option><option value=\"bar\">bar<\/option><option value=\"atm\">atm<\/option><option value=\"mmHg\">mmHg<\/option><option value=\"psi\">psi<\/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\">Press\u00e3o absoluta do g\u00e1s (n\u00e3o a press\u00e3o manom\u00e9trica).<\/small><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-3\">Temperatura (T)<\/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=\"temperatura_t\" id=\"field-3\" aria-describedby=\"calc-info-3\" placeholder=\"e.g. 25\" step=\"any\" value=\"25\"\/><div class=\"grid grid-cols-1\"><select id=\"field-4\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"C\" selected>\u00b0C<\/option><option value=\"K\">K<\/option><option value=\"F\">\u00b0F<\/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-3\">Temperatura do g\u00e1s. Informe 0 K ou menos apenas na escala Kelvin \u2014 fisicamente, o g\u00e1s precisa estar acima do zero absoluto.<\/small><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-5\">Massa molar (M)<\/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=\"massa_molar_m\" id=\"field-5\" aria-describedby=\"calc-unit-5 calc-info-5\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 28.97\" min=\"0\" value=\"28.97\"\/><div class=\"unit\" id=\"calc-unit-5\">g\/mol<\/div><small id=\"calc-info-5\">Massa de um mol do g\u00e1s. Ar \u2248 28,97; N\u2082 = 28,01; O\u2082 = 32,00; CO\u2082 = 44,01; He = 4,00; CH\u2084 = 16,04 g\/mol.<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Recalcular\" id=\"calculate-button\" data-post=\"2117\">Calcular<\/button><button type=\"reset\">Redefinir<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calcular automaticamente<\/label><small>Se ativado, o resultado \u00e9 atualizado automaticamente quando voc\u00ea altera qualquer valor.<\/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> Resultados da densidade do g\u00e1s<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Densidade do g\u00e1s<\/span><span class=\"result-term\">\u03c1<\/span><\/span><span class=\"field-value\" id=\"result-1\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-2\"><span class=\"field-title\"><span>Densidade em outras unidades<\/span><\/span><span class=\"field-value\" id=\"result-2\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><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>Volume molar<\/span><span class=\"result-term\">Vm<\/span><\/span><span class=\"field-value\" id=\"result-3\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-4\"><span class=\"field-title\"><span>Detalhes do c\u00e1lculo<\/span><\/span><span class=\"field-value\" id=\"result-4\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><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\">Copiar link para este c\u00e1lculo<\/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>Deixar um coment\u00e1rio<\/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=\"2117\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">O que voc\u00ea achou deste resultado?<\/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\">Curti <\/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\">\u00datil <\/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\">Confuso <\/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\">Decepcionado <\/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\">Impreciso <\/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>F\u00f3rmula da densidade de gases<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">F\u00f3rmula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[ \\rho = \\frac{P \\cdot M}{R \\cdot T} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Onde:<\/strong><\/p>\n<ul>\n<li>\\(\\rho\\) \u2014 densidade do g\u00e1s (kg\/m\u00b3)<\/li>\n<li>\\(P\\) \u2014 press\u00e3o absoluta do g\u00e1s (Pa)<\/li>\n<li>\\(M\\) \u2014 massa molar do g\u00e1s (kg\/mol)<\/li>\n<li>\\(R\\) \u2014 constante universal dos gases, \\(8.314462618\\ \\text{J\u00b7mol}^{-1}\\text{\u00b7K}^{-1}\\)<\/li>\n<li>\\(T\\) \u2014 temperatura absoluta (K)<\/li>\n<\/ul>\n<p>Esta \u00e9 a lei dos gases ideais \\(PV = nRT\\) reorganizada para a densidade: como \\(n = m\/M\\), a densidade \\(\\rho = m\/V\\) se reduz \u00e0 press\u00e3o multiplicada pela massa molar, dividida por \\(RT\\). A mesma rela\u00e7\u00e3o fornece o volume molar, \\(V_m = RT\/P\\), de modo que \\(\\rho = M \/ V_m\\).<\/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>Densidade de gases \u2013 exemplo de c\u00e1lculo<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Exemplo:<\/strong> calcule a densidade do ar seco (M = 28,97 g\/mol) a 101,325 kPa e 25 \u00b0C \u2014 condi\u00e7\u00f5es ambientes padr\u00e3o.<\/p>\n<p>\\[ T = 25 + 273.15 = 298.15\\ \\text{K}, \\quad P = 101.325\\ \\text{kPa} = 101{,}325\\ \\text{Pa}, \\quad M = 0.02897\\ \\text{kg\/mol} \\]<\/p>\n<p>\\[ \\rho = \\frac{101{,}325 \\times 0.02897}{8.314462618 \\times 298.15} = \\frac{2935.41}{2478.96} \\approx 1.1840\\ \\text{kg\/m}^3 \\]<\/p>\n<p><strong>Resultado:<\/strong> \\(\\rho \\approx 1.184\\ \\text{kg\/m}^3\\) (o mesmo que 1,184 g\/L). O volume molar \u00e9 \\(V_m = RT\/P \\approx 24.465\\ \\text{L\/mol}\\).<\/p>\n<p>\n\r\n<\/section>\n<h2>Como usar a calculadora de densidade de gases<\/h2>\n<ol>\n<li>Informe a <strong>Press\u00e3o (P)<\/strong> e escolha a unidade (kPa, Pa, bar, atm, mmHg ou psi). Use press\u00e3o absoluta, n\u00e3o press\u00e3o manom\u00e9trica.<\/li>\n<li>Informe a <strong>Temperatura (T)<\/strong> e a escala (\u00b0C, K ou \u00b0F). O valor \u00e9 convertido automaticamente para kelvin.<\/li>\n<li>Informe a <strong>Massa molar (M)<\/strong> em g\/mol. Use 28,97 para o ar, ou o valor de um g\u00e1s puro (O\u2082 = 32,00, CO\u2082 = 44,01, He = 4,00, CH\u2084 = 16,04, N\u2082 = 28,01).<\/li>\n<li>Leia a <strong>Densidade do g\u00e1s<\/strong> em kg\/m\u00b3, a tabela de convers\u00e3o para outras unidades e o volume molar em L\/mol.<\/li>\n<li>A se\u00e7\u00e3o <strong>Detalhes do c\u00e1lculo<\/strong> mostra a substitui\u00e7\u00e3o completa, para que voc\u00ea possa conferir cada etapa manualmente.<\/li>\n<\/ol>\n<h2>O que \u00e9 densidade de gases e por que ela importa<\/h2>\n<p>A densidade de um g\u00e1s \u00e9 a massa por unidade de volume. Diferentemente de l\u00edquidos e s\u00f3lidos, os gases s\u00e3o fortemente afetados pela press\u00e3o e pela temperatura: comprima um g\u00e1s e a densidade aumenta; aque\u00e7a-o a press\u00e3o constante e ela diminui. Em condi\u00e7\u00f5es ambientes, um g\u00e1s costuma pesar apenas cerca de 1 kg por metro c\u00fabico \u2014 aproximadamente um mil\u00e9simo da densidade da \u00e1gua \u2014 e \u00e9 por isso que pequenos erros nas condi\u00e7\u00f5es podem alterar o resultado de forma percept\u00edvel.<\/p>\n<p>A f\u00f3rmula mostra claramente os dois fatores. A densidade \u00e9 <em>diretamente proporcional<\/em> \u00e0 press\u00e3o (comportamento previsto pela lei de Boyle: reduzir o volume \u00e0 metade dobra a densidade) e <em>inversamente proporcional<\/em> \u00e0 temperatura absoluta (comportamento previsto pela lei de Charles). Ela tamb\u00e9m \u00e9 diretamente proporcional \u00e0 massa molar \u2014 por isso o di\u00f3xido de carbono (M = 44 g\/mol) \u00e9 cerca de 1,5 vez mais denso que o ar, e o h\u00e9lio (M = 4 g\/mol) \u00e9 cerca de sete vezes mais leve, a raz\u00e3o pela qual o CO\u2082 se acumula no ch\u00e3o enquanto bal\u00f5es de h\u00e9lio sobem.<\/p>\n<p>A densidade de gases \u00e9 usada o tempo todo na engenharia e na ci\u00eancia: no dimensionamento de compressores e tubula\u00e7\u00f5es, na convers\u00e3o entre vaz\u00f5es volum\u00e9tricas e m\u00e1ssicas, na calibra\u00e7\u00e3o de medidores de vaz\u00e3o, na previs\u00e3o de empuxo e do comportamento de plumas, e na convers\u00e3o de volumes de g\u00e1s em problemas de estequiometria. Por exemplo, o valor do ar na atmosfera padr\u00e3o ISA \u2014 1,225 kg\/m\u00b3 a 101,325 kPa e 15 \u00b0C \u2014 \u00e9 a refer\u00eancia usada nos c\u00e1lculos de desempenho de aeronaves.<\/p>\n<p>Como moles de g\u00e1s submetidos \u00e0s mesmas \\(P\\) e \\(T\\) ocupam volumes iguais, independentemente da identidade do g\u00e1s (princ\u00edpio de Avogadro), o volume molar \u00e9 o mesmo para todo g\u00e1s ideal em determinadas condi\u00e7\u00f5es: 22,414 L\/mol a 0 \u00b0C e 101,325 kPa, e cerca de 24,465 L\/mol a 25 \u00b0C. Nossa <a href=\"https:\/\/wpcalc.com\/pt\/quimica\/calculadora-lei-de-avogadro-2\/\">calculadora da lei de Avogadro<\/a> e a <a href=\"https:\/\/wpcalc.com\/en\/chemistry\/gay-lussacs-law-calculator\/\">calculadora da lei de Gay-Lussac<\/a> exploram essas rela\u00e7\u00f5es entre press\u00e3o, temperatura e volume com mais detalhes.<\/p>\n<h2>Premissas, limita\u00e7\u00f5es e dicas pr\u00e1ticas<\/h2>\n<ul>\n<li><strong>Sup\u00f5e-se comportamento de g\u00e1s ideal.<\/strong> A calculadora adota o fator de compressibilidade \\(Z = 1\\). Isso \u00e9 preciso dentro de uma fra\u00e7\u00e3o de por cento para os gases comuns pr\u00f3ximos das condi\u00e7\u00f5es ambientes, mas em altas press\u00f5es ou baixas temperaturas os gases reais se desviam. Nesses casos, \u00e9 necess\u00e1ria uma corre\u00e7\u00e3o de g\u00e1s real, \\(\\rho = PM\/(ZRT)\\) \u2014 veja nossa <a href=\"https:\/\/wpcalc.com\/pt\/quimica\/calculadora-equacao-de-van-der-waals\/\">calculadora da equa\u00e7\u00e3o de Van der Waals<\/a> para um modelo mais realista.<\/li>\n<li><strong>Use press\u00e3o absoluta e temperatura absoluta.<\/strong> Leituras de press\u00e3o manom\u00e9trica precisam ter a press\u00e3o atmosf\u00e9rica somada (por exemplo, 2 bar manom\u00e9tricos = 3 bar absolutos \u2248 300 kPa), e valores em Celsius ou Fahrenheit s\u00e3o convertidos internamente para Kelvin.<\/li>\n<li><strong>Aten\u00e7\u00e3o \u00e0 condensa\u00e7\u00e3o.<\/strong> Perto do ponto de orvalho ou do ponto cr\u00edtico de um g\u00e1s, parte da subst\u00e2ncia pode estar no estado l\u00edquido e a densidade de g\u00e1s ideal deixa de fazer sentido.<\/li>\n<li><strong>Sup\u00f5e-se g\u00e1s seco.<\/strong> O ar \u00famido \u00e9 um pouco menos denso que o ar seco, porque o vapor de \u00e1gua (M = 18 g\/mol) substitui mol\u00e9culas mais pesadas; para trabalhos de precis\u00e3o, use a massa molar m\u00e9dia da mistura real.<\/li>\n<li><strong>Misturas de gases:<\/strong> use a massa molar m\u00e9dia ponderada pelas fra\u00e7\u00f5es molares. Para o ar, \\(0.21 \\times 32 + 0.78 \\times 28 + \\cdots \\approx 28.97\\ \\text{g\/mol}\\). Nossa <a href=\"https:\/\/wpcalc.com\/pt\/quimica\/calculadora-composicao-percentual\/\">calculadora de composi\u00e7\u00e3o percentual<\/a> pode ajudar a encontrar as massas molares de compostos.<\/li>\n<li><strong>Verifica\u00e7\u00e3o r\u00e1pida:<\/strong> a 101,325 kPa, todo g\u00e1s ideal tem densidade de \\(M\/22.414\\) g\/L a 0 \u00b0C \u2014 o ar deve dar \u2248 1,293 g\/L, o metano \u2248 0,716 g\/L. Se o seu resultado estiver muito distante dessas refer\u00eancias, confira as unidades dos dados informados.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Calcule a densidade de qualquer g\u00e1s a partir da press\u00e3o absoluta, da temperatura e da massa molar usando a lei dos gases ideais. Informe os valores em kPa, Pa, bar, atm, psi ou mmHg e em \u00b0C, K ou \u00b0F \u2014 o resultado \u00e9 exibido em kg\/m\u00b3, g\/L e lb\/ft\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":[3],"tags":[41],"class_list":["post-2117","post","type-post","status-publish","format-standard","hentry","category-quimica","tag-gases"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2117","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/comments?post=2117"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2117\/revisions"}],"predecessor-version":[{"id":2722,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2117\/revisions\/2722"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/media?parent=2117"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/categories?post=2117"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/tags?post=2117"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}