For example, white paint is quoted as having an absorptivity of 0.16, while having an emissivity of 0.93.
22.
:: : : " Attenuated " is a better word than " blocked ", and said chart shows absorptivity versus photon energy.
23.
For manufacturing solar cells, silicon has relatively low absorptivity for the sunlight meaning about 100 micrometers of Si is needed to absorb most sunlight.
24.
In contrast, the absorptivity of GaAs is so high that only a few micrometers of thickness are needed to absorb all of the light.
25.
On occasions when the material is in thermodynamic equilibrium or in a state known as local thermodynamic equilibrium, the emissivity and absorptivity become equal.
26.
The emissivity of a material is tremendously frequency dependent, and is related to absorptivity ( of which shiny metal surfaces have very little ).
27.
Longitudinal circulation, however, is a result of the heat capacity of water, it's absorptivity, and it's mixing.
28.
Thus, for longwave radiation, one symbol ? denotes both the emissivity and absorptivity of the atmosphere, for any stream of infrared radiation.
29.
Medium-to-dark, colors with high absorptivity, should be used on surfaces of thermal mass elements that will be in direct sunlight.
30.
Tabor experimented with various coatings to optimize the absorptivity of solar energy, with minimizing the re-radiation, or emissivity of the heat absorbed.
