# Stefan-Boltzmann constant

The Stefan-Boltzmann constant is a physical constant that appears in the Stefan-Boltzmann law, which states that the total power radiated by a black body is proportional to the fourth power of its absolute temperature. The constant is named after Austrian physicist Josef Stefan and German physicist Ludwig Boltzmann.

The value of the Stefan-Boltzmann constant is:

σ = 5.670367(13)×10−8 W⋅m−2⋅K−4

The Stefan-Boltzmann constant is often used in calculations involving black body radiation. For example, it can be used to calculate the total power radiated by the Sun, or to determine the temperature of a star from its observed luminosity. What is unit of Stefan Boltzmann constant? The Stefan-Boltzmann constant is the constant of proportionality in the Stefan-Boltzmann law: the power radiated by a black body per unit area is proportional to the fourth power of its thermodynamic temperature. The value of the Stefan-Boltzmann constant is \$sigma = 5.670367(13) times 10^{-8} mathrm{W,m^{-2},K^{-4}}\$.

##### What is Stefan's Boltzmann law explain?

Stefan's Boltzmann law is a physical law that describes the radiant power emitted by a black body in terms of its temperature. The law was first proposed by Austrian physicist Josef Stefan in 1879.

The Stefan-Boltzmann law states that the total radiant power emitted by a black body is proportional to the fourth power of its absolute temperature. The constant of proportionality is known as the Stefan-Boltzmann constant and has a value of 5.67×10−8 W⋅m−2⋅K−4.

The Stefan-Boltzmann law is a consequence of the fact that the radiation emitted by a black body is a function of its temperature. The higher the temperature of a black body, the greater the amount of radiation it will emit.

The Stefan-Boltzmann law is often used to determine the surface temperature of a star. By measuring the total radiant power emitted by a star, and using the Stefan-Boltzmann law, it is possible to calculate the star's surface temperature.

### What is Stefan Boltzmann constant used for?

The Stefan-Boltzmann constant is the constant of proportionality in the Stefan-Boltzmann law: the power emitted by a black body per unit area is proportional to the fourth power of its temperature. The value of the Stefan-Boltzmann constant is \$sigma = 5.670367(13) times 10^{-8} mathrm{W cdot m^{-2} cdot K^{-4}}\$.

The Stefan-Boltzmann law is used in a variety of applications, most notably in astrophysics and in the study of planetary atmospheres. In astrophysics, the Stefan-Boltzmann law is used to calculate the luminosity of a star, given its surface temperature. This is important in determining the properties of stars, as well as in calculating the distances to stars. In the study of planetary atmospheres, the Stefan-Boltzmann law is used to calculate the temperature of a planet, given its distance from its star. This is important in understanding the habitability of a planet, as well as in determining the composition of its atmosphere.

### What is Stefan's formula?

Stefan's law is a physical law that states that the total heat flux (radiant plus conductive) from a body is proportional to the fourth power of its absolute temperature. In mathematical terms, the heat flux (q) is given by:

q = σ*T^4

where σ is the Stefan-Boltzmann constant and T is the temperature of the body in Kelvins.

The law is named after Josef Stefan, who first published it in 1879. Where is Stefan-Boltzmann law used? The Stefan-Boltzmann law is used in a variety of fields, including engineering and astrophysics. In engineering, the law is used to calculate the heat transfer from a hot body to its surroundings. In astrophysics, the law is used to calculate the luminosity of a star.