17-1209

spectral absorptivity (of an absorbing material) 

spectral internal absorptance of a layer of the material such that the path of the radiation is of unit length, and under conditions in which the boundary of the material has no influence

Unit: 1

NOTE The unit length must be specified. If a new unit length is used that is k times the magnitude of the original one, then the value of  will change to  .

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