{"id":718643,"date":"2024-05-18T11:52:17","date_gmt":"2024-05-18T06:22:17","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=718643"},"modified":"2025-04-28T17:29:21","modified_gmt":"2025-04-28T11:59:21","slug":"stefans-law-2","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/","title":{"rendered":"Stefan&#8217;s Law"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#What_is_Stefans_Law\" title=\"What is Stefan&#8217;s Law?\">What is Stefan&#8217;s Law?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#Stefan-Boltzmann_Constant\" title=\"Stefan-Boltzmann Constant\">Stefan-Boltzmann Constant<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#Value_of_the_Stefan-Boltzmann_Constant\" title=\"Value of the Stefan-Boltzmann Constant\">Value of the Stefan-Boltzmann Constant<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#Examples_of_Stefans_Law\" title=\"Examples of Stefan&#8217;s Law\">Examples of Stefan&#8217;s Law<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#Welding\" title=\"Welding\">Welding<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#Calculating_the_Radius_of_Stars\" title=\"Calculating the Radius of Stars\">Calculating the Radius of Stars<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#Aluminium_Foil\" title=\"Aluminium Foil\">Aluminium Foil<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#Understanding_Stefans_Law_in_Physics\" title=\"Understanding Stefan&#8217;s Law in Physics\">Understanding Stefan&#8217;s Law in Physics<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#Applications_of_Stefan-Boltzmann_Law\" title=\"Applications of Stefan-Boltzmann Law\">Applications of Stefan-Boltzmann Law<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#FAQs_on_Stefans_Law\" title=\"FAQs on Stefan&#8217;s Law\">FAQs on Stefan&#8217;s Law<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#Who_proposed_Stefans_Law_and_when\" title=\"Who proposed Stefan&#039;s Law and when?\">Who proposed Stefan&#039;s Law and when?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#Is_the_Stefan-Boltzmann_law_applicable_to_all_bodies\" title=\"Is the Stefan-Boltzmann law applicable to all bodies?\">Is the Stefan-Boltzmann law applicable to all bodies?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#What_is_the_value_of_Stefan-Boltzmanns_constant\" title=\"What is the value of Stefan-Boltzmann\u2019s constant?\">What is the value of Stefan-Boltzmann\u2019s constant?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#How_was_the_Stefan-Boltzmann_constant_discovered\" title=\"How was the Stefan-Boltzmann constant discovered?\">How was the Stefan-Boltzmann constant discovered?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#What_is_Stefans_Law-2\" title=\"What is Stefan&#039;s Law?\">What is Stefan&#039;s Law?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/infinitylearn.com\/surge\/science\/stefans-law\/#How_is_the_Stefan-Boltzmann_constant_derived\" title=\"How is the Stefan-Boltzmann constant derived?\">How is the Stefan-Boltzmann constant derived?<\/a><\/li><\/ul><\/nav><\/div>\n<p><strong>Josef Stefan<\/strong> was an Austrian physicist who made significant contributions to understanding blackbody radiation. In 1879, he formulated Stefan&#8217;s Law, which states that the radiant energy of a blackbody is proportional to the fourth power of its temperature. This means that a perfect blackbody, an object that absorbs all radiation falling on it, emits more energy as it gets hotter. <strong>Stefan&#8217;s Law<\/strong> was a crucial step in studying blackbody radiation and paved the way for the quantum theory of radiation.<\/p>\n<p>Stefan began his career as a lecturer in mathematical physics in 1858 and became a professor of physics in 1863. By 1866, he was the director of the Physical Institute at the University of Vienna. Five years later, he empirically derived <strong>Stefan&#8217;s Law<\/strong>, which was later theoretically confirmed by Ludwig Boltzmann. This combined work led to the law being named the Stefan-Boltzmann Law. Understanding &#8220;<strong>What is Stefan&#8217;s Law<\/strong>&#8221; helps us appreciate how energy emission changes with temperature.<\/p>\n<p style=\"text-align: center;\"><em><strong>Also Check: <a href=\"https:\/\/infinitylearn.com\/surge\/science\/weins-displacement-law\/\">Wein&#8217;s Displacement Law<\/a><\/strong><\/em><\/p>\n<p>Stefan&#8217;s Law, also known as the Stefan-Boltzmann Law, explains the power radiated by a black body based on its temperature and surface area. Widely used in thermodynamics and astrophysics, Stefan&#8217;s Law helps us understand how objects like stars and planets emit radiation. Scientists use Stefan&#8217;s Law to study these celestial bodies and their behaviors. Additionally,<strong> Stefan&#8217;s Law<\/strong> has practical applications, such as in designing solar panels and other energy conversion devices. By applying Stefan&#8217;s Law, we can improve the efficiency of these technologies and gain deeper insights into the natural world.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-718647\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/05\/Stefan39s-boltzmann-law-copy-1.jpg\" alt=\"Stefan's boltzmann law\" width=\"1200\" height=\"665\" srcset=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/05\/Stefan39s-boltzmann-law-copy-1.jpg 1200w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/05\/Stefan39s-boltzmann-law-copy-1-300x166.jpg 300w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/05\/Stefan39s-boltzmann-law-copy-1-1024x567.jpg 1024w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/05\/Stefan39s-boltzmann-law-copy-1-768x426.jpg 768w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/05\/Stefan39s-boltzmann-law-copy-1-150x83.jpg 150w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_is_Stefans_Law\"><\/span>What is Stefan&#8217;s Law?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Stefan&#8217;s Law, also known as the <strong>Stefan-Boltzmann Law<\/strong>, states that the total energy emitted per unit surface area of a black body across all wavelengths per unit of time is directly proportional to the fourth power of the black body&#8217;s thermodynamic temperature and its emissivity. In simpler terms, Stefan&#8217;s Law explains that the power emitted by a black body increases rapidly with its temperature. This law highlights that as the temperature of a black body rises, the amount of energy it emits also increases significantly. Stefan&#8217;s Law is crucial for understanding the relationship between temperature and radiation in black bodies.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Stefan-Boltzmann_Constant\"><\/span>Stefan-Boltzmann Constant<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The Stefan-Boltzmann Constant, named after physicists Josef Stefan and Ludwig Boltzmann, is a key component in Stefan&#8217;s Law. This constant, symbolized by the Greek letter \u03c3, serves as the proportionality factor in Stefan&#8217;s Law.<\/p>\n<p style=\"text-align: center;\"><em><strong>Also Check: <a href=\"https:\/\/infinitylearn.com\/surge\/formulas\/ohms-law-formula\/\">Ohm&#8217;s Law<\/a><\/strong><\/em><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Value_of_the_Stefan-Boltzmann_Constant\"><\/span>Value of the Stefan-Boltzmann Constant<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In the SI unit system, the value of the Stefan-Boltzmann Constant is approximately 5.67 \u00d7 10<sup>-8<\/sup> watts per square meter per Kelvin to the fourth power (W\/(m<sup>\u00b2<\/sup>K<sup>\u2074<\/sup>)). Here are its values in different unit systems:<\/p>\n<ul>\n<li><strong>SI Units:<\/strong> 5.670367 \u00d7 10<sup>-8<\/sup> W\/(m<sup>\u00b2<\/sup>K<sup>\u2074<\/sup>)<\/li>\n<li><strong>CGS Units:<\/strong> 5.6704 \u00d7 10<sup>5<\/sup> erg\/(cm<sup>\u00b2<\/sup>s K<sup>\u2074<\/sup>)<\/li>\n<li><strong>Thermochemistry Units:<\/strong> 11.7 \u00d7 10<sup>8<\/sup> cal\/(cm<sup>\u00b2<\/sup> day K<sup>\u2074<\/sup>)<\/li>\n<li><strong>U.S. Customary Units:<\/strong> 1.714 \u00d7 10<sup>9<\/sup> BTU\/(ft<sup>\u00b2<\/sup> hr \u00b0R<sup>\u2074<\/sup>)<\/li>\n<\/ul>\n<p>The dimension of the Stefan-Boltzmann Constant is [M]<sup>1<\/sup>[L]<sup>0<\/sup>[T]<sup>-3<\/sup>[K]<sup>-4<\/sup>, representing mass (M), length (L), time (T), and temperature (K).<\/p>\n<p>Understanding the Stefan-Boltzmann Constant is crucial for applying Stefan&#8217;s Law, which helps determine the radiant energy emitted by a blackbody based on its temperature.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Examples_of_Stefans_Law\"><\/span>Examples of Stefan&#8217;s Law<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Welding\"><\/span>Welding<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Welding is a process that joins two pieces of metal by heating them until they fuse together. During welding, sparks can be seen because energy is radiated into the surroundings. This demonstrates Stefan&#8217;s Law, which explains how energy is emitted as heat.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Calculating_the_Radius_of_Stars\"><\/span>Calculating the Radius of Stars<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The radius of a star can be calculated based on its luminosity, which is the total power radiated by the star into space. This power depends on the star&#8217;s surface area and temperature. Stefan&#8217;s Law shows the relationship between an object&#8217;s surface area, temperature, and the rate of radiation it emits, helping astronomers determine the size of stars.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Aluminium_Foil\"><\/span>Aluminium Foil<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Aluminium foil is another example of Stefan&#8217;s Law in action. This law explains that objects with lower emissivity radiate less energy. Since aluminium foil has a low emissivity of about 0.1 units, it effectively keeps food warmer for longer periods by minimizing radiation loss.<\/p>\n<p>These examples illustrate how Stefan&#8217;s Law applies to various real-world scenarios, from welding and astronomy to everyday uses like aluminium foil.<\/p>\n<p style=\"text-align: center;\"><em><strong>Also Check: Kirchoff&#8217;s Law<\/strong><\/em><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Understanding_Stefans_Law_in_Physics\"><\/span>Understanding Stefan&#8217;s Law in Physics<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Stefan&#8217;s Law<\/strong>, also known as the Stefan-Boltzmann Law, explains that the total radiant heat power emitted by a surface is proportional to the fourth power of its absolute temperature. The formula for Stefan&#8217;s Law is:<\/p>\n<math><semantics><mrow><mi>\n<\/mi><\/mrow><annotation>E = \\sigma T^4<\/annotation><\/semantics><\/math>\n<p>E=\u03c3T<sup>4<\/sup><\/p>\n<p>In this formula:<\/p>\n<ul>\n<li><strong>E<\/strong> represents the radiant heat energy emitted per unit area per second.<\/li>\n<li><strong>\u03c3<\/strong> is the Stefan-Boltzmann constant.<\/li>\n<li><strong>T<\/strong> is the absolute temperature.<\/li>\n<\/ul>\n<p>Using Stefan&#8217;s Law, we can estimate the energy emitted by the Sun. Given the Sun\u2019s photosphere temperature is around 6000 K, the energy emitted can be calculated as:<\/p>\n<p>E<sub>sun<\/sub>\u200b=\u03f5\u03c3T<sup>4<\/sup><\/p>\n<p>Assuming<\/p>\n<math><semantics><annotation>\\epsilon = 1<\/annotation><\/semantics><\/math>\n<p>\u03f5=1:<\/p>\n<p>E<sub>sun<\/sub>\u200b=1\u00d75.67\u00d710<sup>\u22128<\/sup>\u00d7(6000)<sup>4<\/sup><\/p>\n<p>This results in an approximate energy emission of:<\/p>\n<math><semantics><mrow><msub><mi>\n<\/mi><\/msub><\/mrow><annotation>E_{\\text{sun}} \\approx 25.12 \\times 10^9 \\, \\text{J m}^{-2} \\text{s}^{-1}<\/annotation><\/semantics><\/math>\n<p>E<sub>sun<\/sub>\u200b\u224825.12\u00d710<sup>9<\/sup>J m<sup>\u22122<\/sup>s<sup>\u22121<\/sup><\/p>\n<p>Stefan&#8217;s Law helps us understand the relationship between temperature and emitted radiation, providing insights into various physical phenomena.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Applications_of_Stefan-Boltzmann_Law\"><\/span>Applications of Stefan-Boltzmann Law<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Stefan&#8217;s Law, also known as the <strong>Stefan-Boltzmann Law<\/strong>, has many real-world applications. Here are a few important uses:<\/p>\n<ol>\n<li>Stefan&#8217;s Law helps scientists calculate the luminosity of celestial bodies such as stars, planets, and galaxies.<\/li>\n<li>The law is also used to understand how greenhouse gases affect our atmosphere. By using Stefan&#8217;s Law, scientists can calculate the amount of energy absorbed by the atmosphere and predict the impact of rising temperatures.<\/li>\n<li>Engineers apply Stefan&#8217;s Law to compare surface temperatures of different materials. This helps them design more power-efficient systems that do not require active cooling.<\/li>\n<\/ol>\n<p>In these ways, Stefan&#8217;s Law plays a crucial role in astronomy, environmental science, and engineering.<\/p>\n<p style=\"text-align: center;\"><em><strong>Also Check: Charles Law<\/strong><\/em><\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQs_on_Stefans_Law\"><\/span>FAQs on Stefan&#8217;s Law<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"Who_proposed_Stefans_Law_and_when\"><\/span>Who proposed Stefan&#039;s Law and when?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tThe Austrian physicist Josef Stefan proposed Stefan's Law in 1879.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"Is_the_Stefan-Boltzmann_law_applicable_to_all_bodies\"><\/span>Is the Stefan-Boltzmann law applicable to all bodies?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tNo, the Stefan-Boltzmann law is only applicable to black bodies, which are surfaces that can absorb all incident heat radiation.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"What_is_the_value_of_Stefan-Boltzmanns_constant\"><\/span>What is the value of Stefan-Boltzmann\u2019s constant?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tIn physics, the value of Stefan-Boltzmann\u2019s constant is approximately 5.670374419 \u00d7 10\u22128 watts per meter\u00b2 per Kelvin\u2074.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"How_was_the_Stefan-Boltzmann_constant_discovered\"><\/span>How was the Stefan-Boltzmann constant discovered?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tThe Stefan-Boltzmann constant is named after Josef Stefan and Ludwig Boltzmann. Josef Stefan discovered this constant based on John Tyndall's 1864 measurements of infrared emissions from a platinum filament. In 1879, Stefan deduced the proportionality to the fourth power of absolute temperature from Tyndall\u2019s work. Ludwig Boltzmann then derived the constant from theoretical principles in 1884, using the work of Adolfo Bartoli on radiation pressure and applying thermodynamics principles.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h3><span class=\"ez-toc-section\" id=\"What_is_Stefans_Law-2\"><\/span>What is Stefan&#039;s Law?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tStefan's Law, or the Stefan-Boltzmann Law, states that the total energy emitted per unit time and per unit area of a blackbody is proportional to the fourth power of the blackbody's temperature.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"sc_fs_faq sc_card \">\n\t\t\t<div>\n\t\t\t\t<h2><span class=\"ez-toc-section\" id=\"How_is_the_Stefan-Boltzmann_constant_derived\"><\/span>How is the Stefan-Boltzmann constant derived?<span class=\"ez-toc-section-end\"><\/span><\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t<p>\n\t\t\t\t\t\tOne way to derive the Stefan-Boltzmann constant is by integrating Planck\u2019s Radiation Formula.\t\t\t\t\t<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/section>\n\t\t\n<script type=\"application\/ld+json\">\n\t{\n\t\t\"@context\": \"https:\/\/schema.org\",\n\t\t\"@type\": \"FAQPage\",\n\t\t\"mainEntity\": [\n\t\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"Who proposed Stefan's Law and when?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"The Austrian physicist Josef Stefan proposed Stefan's Law in 1879.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"Is the Stefan-Boltzmann law applicable to all bodies?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"No, the Stefan-Boltzmann law is only applicable to black bodies, which are surfaces that can absorb all incident heat radiation.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"What is the value of Stefan-Boltzmann\u2019s constant?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"In physics, the value of Stefan-Boltzmann\u2019s constant is approximately 5.670374419 \u00d7 10\u22128 watts per meter\u00b2 per Kelvin\u2074.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"How was the Stefan-Boltzmann constant discovered?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"The Stefan-Boltzmann constant is named after Josef Stefan and Ludwig Boltzmann. Josef Stefan discovered this constant based on John Tyndall's 1864 measurements of infrared emissions from a platinum filament. In 1879, Stefan deduced the proportionality to the fourth power of absolute temperature from Tyndall\u2019s work. Ludwig Boltzmann then derived the constant from theoretical principles in 1884, using the work of Adolfo Bartoli on radiation pressure and applying thermodynamics principles.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"What is Stefan's Law?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Stefan's Law, or the Stefan-Boltzmann Law, states that the total energy emitted per unit time and per unit area of a blackbody is proportional to the fourth power of the blackbody's temperature.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"How is the Stefan-Boltzmann constant derived?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"One way to derive the Stefan-Boltzmann constant is by integrating Planck\u2019s Radiation Formula.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t\t\t\t]\n\t}\n<\/script>\n\n","protected":false},"excerpt":{"rendered":"<p>Josef Stefan was an Austrian physicist who made significant contributions to understanding blackbody radiation. In 1879, he formulated Stefan&#8217;s Law, [&hellip;]<\/p>\n","protected":false},"author":53,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"Stefans Law","_yoast_wpseo_title":"Stefan's Law: Stefan-Boltzmann Constant, Examples & Applications| IL","_yoast_wpseo_metadesc":"Learn about Stefan's Law, proposed by Josef Stefan in 1879, which states that a blackbody's energy emission is proportional to the fourth power of its temperature.","custom_permalink":"science\/stefans-law\/"},"categories":[116],"tags":[],"table_tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Stefan&#039;s Law: Stefan-Boltzmann Constant, Examples &amp; Applications| IL<\/title>\n<meta name=\"description\" content=\"Learn about Stefan&#039;s Law, proposed by Josef Stefan in 1879, which states that a blackbody&#039;s 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