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During absorption spectroscopy, the amount of radiant energy transmitted by the solution under analysis.
The radiant power transmitted by a body divided by the total radiant power incident upon the body. Also known as transmission.
The ratio of the total radiant or luminous flux transmitted by a transparent object to the incident flux, usually given for normal incidence.
When radiant flux is incident on a medium, the ratio of the flux which emerges from the medium to the flux which is incident upon it.