absorptance
n. C1 Advanced ab·sorp·tance
n. the ability of a material to absorb light or heat. It measures how much of the energy is taken in rather than reflected or transmitted.
n. the fraction of incident electromagnetic radiation or thermal energy that is absorbed by a surface or medium. Often expressed as a dimensionless quantity between 0 and 1.
The black paint has a high absorptance of sunlight.
Engineers calculated the absorptance of the solar panels to determine how much energy they could capture during the winter months.
In thermal imaging, the absorptance of a material determines how effectively it converts incoming infrared radiation into heat, which is critical for the accuracy of the final temperature readings.