Electromagnetic radiation (for instance, thermal radiation in the infrared range) may be attenuated in passing. The *albedo* ω is the dimensionless value that is equal the ratio of scattering coefficient (β) to the sum of absorption (k) and *scattering* (β) coefficients:

The single scattering albedo defines the fraction of energy scattering in total energy attenuation. The dependencies of ω on frequency and temperature are determined by the corresponding dependencies of k and β. Albedo is widely used in radiative heat transfer calculations.

#### REFERENCES

Seigel, R. and Howell, J. R. (1992) *Thermal Radiation Heat Transfer*, third edition, Washington D. C., Hemisphere.

Ozisik, M. N. (1985) Radiative transfer and interaction with conduction and convection. New York: Werbel & Peck.

#### References

- Seigel, R. and Howell, J. R. (1992)
*Thermal Radiation Heat Transfer*, third edition, Washington D. C., Hemisphere. - Ozisik, M. N. (1985) Radiative transfer and interaction with conduction and convection. New York: Werbel & Peck.