Radiation - Surfaces Emissivity Coefficients
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:
| Material | Emissivity 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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