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absorptance
This term is a specialized technical descriptor used primarily in physics, optics, and materials science. It refers to a dimensionless ratio, typically expressed as a value between 0 and 1, representing the proportion of energy absorbed relative to the total incident radiation. It is distinct from absorbance, which is a logarithmic measure used in chemistry and spectroscopy to describe the attenuation of light passing through a medium.
Because it describes a specific physical property or a measured ratio, the word is treated as an uncountable noun. It does not refer to a discrete object that can be counted, but rather to a characteristic of a material's interaction with electromagnetic waves.
Meanings
Examples
The solar panel was designed to maximize its absorptance of visible light.
What is the spectral absorptance of this specific polymer at infrared wavelengths?
A perfect blackbody has an absorptance of one across all frequencies.
I need to calculate the total absorptance to determine the heating rate of the surface.
The coating significantly increases the absorptance of the material in the ultraviolet range.
The coating significantly increases the absorptance of the material in the ultraviolet range.
If the absorptance is too low, the device will not capture enough energy to function.
We must consider both reflectance and absorptance when analyzing the energy balance.
The researcher noted that the absorptance varied depending on the angle of incidence.