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Surface Radiation Absorptivity

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Absorptivity can be defined as

  • the ratio of power absorbed to the incident radiant power

For emissivity and emitted light absorptivity is the amount of radiation absorbed by a surface compared to what is absorbed by a black body.

Surface Radiation Absorptivity
Aluminum, anodized 0.14
Aluminum, dull/rough polished 0.4 - 0.65
Aluminum. polished 0.1 - 0.40
Asbestos Cement, old 0.83
Black matte 0.95
Brick, red 0.65
Chromium plate 0.20
Concrete 0.6
Iron, galvanized old 0.89 - 0.92
Grey paint 0.95
Light green paint 0.95
Limestone 0.33 - 0.53
Red clay brick 0.94
Snow, ice granules 0.33
Steel, galvanized (zink oxide) 0.65
Steel, galvanized weathered 0.8
White paint 0.25 - 0.4
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Related Topics


Work, heat and energy systems.

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The radiation constant is the product between the Stefan-Boltzmann constant and the emissivity constant for a material.

Radiation - Surfaces Emissivity Coefficients

Radiation emissivity of common materials like water, ice, snow, grass and more.

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Heat transfer due to emission of electromagnetic waves is known as thermal radiation.

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Daily surface energy from solar radiation.

Solar Radiation through Windows

Heat from sun transmitted through windows.

Surface Emissivity Coefficients

The radiation heat transfer emissivity coefficients for some common materials like aluminum, brass, glass and many more.

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