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|Look up absorbtivity, absorptance, or absorptivity in Wiktionary, the free dictionary.|
In science, the term absorptivity (or absorptance) may refer to:
- Molar absorptivity, in chemistry, a measurement of how strongly a chemical species absorbs light at a given wavelength
- Absorbance, in physics, the fraction of radiation absorbed at a given wavelength
- Reflectivity, the fraction of incident radiation reflected by a surface
- Transmittance, the fraction of incident electromagnetic radiation at a specified wavelength that passes through a sample
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