absorptivity


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Related to absorptivity: Molar absorptivity

absorptivity

 [ab″sorp-tiv´ĭ-te]
a measure of the amount of light absorbed by a solution.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ab·sorp·tiv·i·ty (a),

(ab-sōrp-tiv'i-tē),
1. Synonym(s): specific absorption coefficient
2. Synonym(s): molar absorption coefficient
3. The ability of a material to absorb electromagnetic radiation.
Farlex Partner Medical Dictionary © Farlex 2012

mo·lar ab·sorp·tion co·ef·fic·ient

(ε) (mō'lăr ab-sōrp'shŭn kō-ĕ-fish'ĕnt)
Absorbance (of light) per unit path length (usually the centimeter) and per unit of concentration (moles per liter); a fundamental unit in spectrophotometry.
Synonym(s): absorbancy index (2) , absorptivity (2) .

spe·cif·ic ab·sorp·tion co·ef·fi·cient

(a) (spĕ-sif'ik ăb-sōrp'shŭn kō'ĕ-fish'ĕnt)
Absorbance (of light) per unit path length (usually the centimeter) and per unit of mass concentration.
Compare: molar absorption coefficient
Synonym(s): absorbancy index (1) , absorptivity (1) , extinction coefficient, specific extinction.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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References in periodicals archive ?
When considering a medium with a vanishingly small absorptivity, he allowed for their use as blackbodies by invoking infinite thickness [14, [section]10].
Kirchhoff's Law of Thermal Emission: Blackbody and Cavity Radiation Reconsidered
[[epsilon].sub.a](E, [theta], [phi]) is the absorptivity of the absorber, and [[epsilon].sub.e](E, [theta], [phi]) is the emissivity of the emitter.
A Nanostructure-Based High-Temperature Selective Absorber-Emitter Pair for a Solar Thermophotovoltaic System with Narrowband Thermal Emission
The proposed absorber exhibits an absorption peak at 442 MHz with 99.73% absorptivity. We elaborated on the design principles and processes.
UHF Metamaterial Absorber with Small-Size Unit Cell by Combining Fractal and Coupling Lines
In the analysis, the absorptivity and albedo values of the lunar surface and the latitude were set to 0.87, 0.13, and 20[degrees], respectively, to simulate the thermal environment of Apollo 17 landing area.
Preliminary Thermal Design and Analysis of Lunar Lander for Night Survival
The molar absorptivity and the integrated molar absorptivity in the applied integration ranges of the corresponding main and characteristic absorption bands, both separated and integral, in all the IR and UV/VIS spectra of the chromatographically purified [C.sub.76]-[D.sub.2] samples from this research [2, 3, 38-44] are in excellent agreement.
IR and UV/VIS Spectroscopic Characterization of the Higher Fullerene [C.sub.76]-[D.sub.2] for Its Quantitative and Qualitative Determination
The absorptivity coefficient, [epsilon], is a constant that is essential to the solute itself and is measure of a degree to which particles in the solute absorb light at a particular wavelength.
Detection of Aeromonas hydrophila Using Fiber Optic MicroChannel Sensor
Methylene blue absorption is also an indicator for absorptivity and water absorption [3].
Effect of Bentonite on the Pelleting Properties of Iron Concentrate
Let [[rho].sub.1v] [member of] [0,1] be a spectral hemispherical reflectivity of the boundary [S.sub.1]; [[epsilon].sub.1v] [member of] [0,1] is its spectral hemispherical absorptivity. Then [[rho].sub.1v] and [[epsilon].sub.1v](1 - [[rho].sub.1v]) are the fraction of radiation scattered back and absorbed by the boundary [S.sub.1], whereas the part of transmitted radiation will be equal to [[tau].sub.1v] [equivalent to] 1 - [[rho].sub.1v] - [[epsilon].sub.1v](1 - [[rho].sub.1v]) = (1 - [[epsilon].sub.1v])(1 - [[rho].sub.1v]).
An Iterative Method for Solving of Coupled Equations for Conductive-Radiative Heat Transfer in Dielectric Layers
where, s is absorptivity, c is concentration of absorbing species, b is path length or the thickness of thin film; the rearrangement of eq.
Surface Behavior and Thickness Measurement of Free Standing Thin Film of Liquid Crystal Compound Biphenyl (E7)
The Komar-Tolmachev method [28] also allows to calculate the true molar absorptivity of the complex: e= (3.5-3.9)A-104L mol-1 cm-1.
Complex Formation and Liquid-Liquid Extraction in the Niobium(V) - 2,4-Dihydroxythiophenol- Hydrophobic Amines System
Plans for future projects include expanding the capabilities of the lab's direct laser deposition equipment to enhance metallic absorptivity. The lab will also continue to work with domestic-based, low-cost titanium powder suppliers for open-source materials in the supply chain.
Adding up
The main part of solar thermal heaters is the absorber surface which must have a maximum absorptivity ([alpha) and minimum emissivity ([epsilon]) of solar radiation.
Application of CuCoMn[O.sub.x] coat by sol gel technique on aluminum and copper substrates for solar absorber application

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