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# Radiation - Surface Emissivity Coefficients

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

The emissivity coefficient - ε - indicates the radiation of heat from a body according the Stefan-Boltzmann Law, compared with the radiation of heat from a ideal black body where the emissivity coefficient ε = 1.

Emissivity coefficients - ε - for some common material surfaces:

MaterialEmissivity Coefficient
- ε -
Water (0 - 100oC) 0.95 - 0.963
Ice 0.96 - 0.99
Snow 0.96 - 0.98
Sand 0.9
Granite 0.96
Green Grass 0.975 - 0.986

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• ### Insulation

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## Related Documents

Solar radiation absorbed by various materials.
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Radiation heat emissivity of unoxidized, oxidized and polished aluminum.
• ### Building Materials - Radiation Constants

The radiation constant is the product between the Stefan-Boltzmann constant and the emissivity constant for a material.
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Heat transfer due to emission of electromagnetic waves is known as thermal radiation.
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• ### Surface Emissivity Coefficients

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

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## Citation

• The Engineering ToolBox (2003). Radiation - Surface Emissivity Coefficients . [online] Available at: https://www.engineeringtoolbox.com/radiation-heat-emissivity-d_432.html [Accessed Day Month Year].

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7.8.15

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