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What is an absorptivity?

What is an absorptivity? Here are some definitions.

Noun
  1. The quality of being absorptive; absorptiveness. [First attested in the mid 19th century.]
  2. (thermodynamics) The fraction of radiation absorbed by a surface to the total radiation incident on the surface. [First attested in the mid 19th century.]
  3. (analytical) The constant a in the Beer's law relation A = abc, where A is the absorbance, b the path length, and c the concentration of solution. Also known as absorptive power. Formerly known as absorbency index; absorption constant; extinction coefficient.
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Pre-blended dry-mortar with high flow capacity, hardens without shrinkage and has a high capillary absorptivity.
This prerequisite ensures a minimum change in molar absorptivity in both environments.
The DBP absorption test is one of the most widely used methods for measuring the level of aggregate absorptivity in carbon black.
May vary depending on the application method, texture and surface absorptivity.
Some conditions, such as ambient temperature, decay heat of the contents, or package emissivity or absorptivity, may not be exactly represented in a thermal test.
The ablation threshold values depend upon both the UV radiation wavelength and the polymer absorptivity.

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