The law states that the total energy radiated per unit surface area of a black body across all wavelengths per unit time ( also known as the black-body radiant exitance or emissive power ) is directly proportional to the fourth power of the body's absolute temperature.
12.
In slightly different terms, the emissive power of an arbitrary opaque body of fixed size and shape at a definite temperature can be described by a dimensionless ratio, sometimes called the emissivity, the ratio of the emissive power of the body to the emissive power of a black body of the same size and shape at the same fixed temperature.
13.
In slightly different terms, the emissive power of an arbitrary opaque body of fixed size and shape at a definite temperature can be described by a dimensionless ratio, sometimes called the emissivity, the ratio of the emissive power of the body to the emissive power of a black body of the same size and shape at the same fixed temperature.
14.
In slightly different terms, the emissive power of an arbitrary opaque body of fixed size and shape at a definite temperature can be described by a dimensionless ratio, sometimes called the emissivity, the ratio of the emissive power of the body to the emissive power of a black body of the same size and shape at the same fixed temperature.
15.
Thus Kirchhoff's law of thermal radiation can be stated : " For any material at all, radiating and absorbing in thermodynamic equilibrium at any given temperature, for every wavelength, the ratio of emissive power to absorptive ratio has one universal value, which is characteristic of a perfect black body, and is an emissive power which we here represent by . " ( For our notation, Kirchhoff's original notation was simply .)
16.
Thus Kirchhoff's law of thermal radiation can be stated : " For any material at all, radiating and absorbing in thermodynamic equilibrium at any given temperature, for every wavelength, the ratio of emissive power to absorptive ratio has one universal value, which is characteristic of a perfect black body, and is an emissive power which we here represent by . " ( For our notation, Kirchhoff's original notation was simply .)
17.
Thus "'Kirchhoff's law of thermal radiation "'can be stated : " For any material at all, radiating and absorbing in thermodynamic equilibrium at any given temperature " ", for every wavelength " ", the ratio of emissive power to absorptive ratio has one universal value, which is characteristic of a perfect black body, and is an emissive power which we here represent by " " . " ( For our notation, Kirchhoff's original notation was simply .)
18.
Thus "'Kirchhoff's law of thermal radiation "'can be stated : " For any material at all, radiating and absorbing in thermodynamic equilibrium at any given temperature " ", for every wavelength " ", the ratio of emissive power to absorptive ratio has one universal value, which is characteristic of a perfect black body, and is an emissive power which we here represent by " " . " ( For our notation, Kirchhoff's original notation was simply .)
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