Using the definition of skin depth, the unitless absorptivity, A = P _ d / P _ o where P _ o is the incident power, of the grid is
42.
The equality of absorptivity and emissivity here demonstrated is specific for thermodynamic equilibrium at temperature and is in general not to be expected to hold when conditions of thermodynamic equilibrium do not hold.
43.
The condition of thermodynamic equilibrium is necessary in the statement, because the equality of emissivity and absorptivity often does not hold when the material of the body is not in thermodynamic equilibrium.
44.
For wavelengths longer than ~ 200nm, i . e . UVA and UVB, there is little difference between the absorptivity of UV in liquid water than the absorptivity of visible light.
45.
For wavelengths longer than ~ 200nm, i . e . UVA and UVB, there is little difference between the absorptivity of UV in liquid water than the absorptivity of visible light.
46.
In his magisterial proof of the validity of Kirchhoff's law of equality of radiative emissivity and absorptivity, Planck makes repeated and essential use of the Stokes-Helmholtz reciprocity principle.
47.
The Beer Lambert law relates the absorption of light to the concentration of the light-absorbing material, the optical path length, and an intrinsic property of the material called molar absorptivity.
48.
It has been assumed that : the absorptivity is 1-A, the asteroid is spherical, it is on a circular orbit, and that the Sun's energy output is isotropic.
49.
Solar absorptivity is closely related to color, varying from about 20 % for white materials to 90 % for black materials; thus samples of different colors will reach different on-exposure temperatures.
50.
Here, the dimensionless coefficient of absorption ( or the absorptivity ) is the fraction of incident light ( power ) that is absorbed by the body when it is radiating and absorbing in thermodynamic equilibrium.
