Stefan-Boltzmann constant or radiation coefficient is a fundamental physical constant used in the study of thermodynamics and radiative heat transfer. It is denoted by the symbol σ and has a value of 5.67 * 10-8 W/m2K4. Let us understand this in detail.

What is Radiation Coefficient or Stefan-Boltzmann constant?

Radiation coefficient or Stefan-Boltzmann constant is the proportionality constant that relates the total radiated energy per unit surface area of a black body to its temperature. It represents the power radiated per unit surface area and is expressed in units of watts per square meter per Kelvin to the fourth power (W/m2K4).

Why is it important?

The Stefan-Boltzmann constant is important in the study of thermodynamics and radiative heat transfer. It is used to calculate the radiant heat flux emitted by a black body at a given temperature. The constant is also used in the calculation of the radiation heat transfer between two surfaces at different temperatures.

What is a black body?

A black body is an idealized object that absorbs all radiation that falls on it, regardless of the frequency or angle of incidence. It also emits radiation at all frequencies and angles, and its emission spectrum is solely dependent on its temperature. A black body is used as a reference standard for radiative energy transfer.

Conclusion:

In conclusion, the Stefan-Boltzmann constant or radiation coefficient is a fundamental physical constant used in the study of thermodynamics and radiative heat transfer. It is denoted by the symbol σ and has a value of 5.67 * 10-8 W/m2K4. It is important in the calculation of radiant heat flux emitted by a black body and in the calculation of radiation heat transfer between two surfaces at different temperatures.