| 21. | Using low emissivity glass on surface # 2 will add another R-value.
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| 22. | The emissivity of a natural interface is always between = 0 } } and 1.
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| 23. | Each material has a different emissivity, which may vary by temperature and infrared wavelength.
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| 24. | A shiny metal surface has low emissivity.
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| 25. | Therefore, it is possible to create visibly dark colored surfaces with low thermal emissivity.
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| 26. | The absorption spectrum measured by THEMIS contains two kinds of information : temperature and emissivity.
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| 27. | Real world objects are gray objects, with their absorption being equal to their emissivity.
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| 28. | For aged conductor, the emissivity for heat radiation and the absorption of sunlight increases.
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| 29. | At any given wavelength the absorptivity of the atmosphere will be equal to the emissivity.
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| 30. | From RCA and textbooks, emissivity of oxide coated filaments is about 0.3.
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