Transmittance of the surface of a material is its effectiveness in transmitting radiant energy. It is the fraction of incident electromagnetic power that is transmitted through a sample, in contrast to the transmission coefficient, which is the ratio of the transmitted to incident electric field.

What does percent transmittance mean?

How much of a particular frequency gets through the compound is measured as percentage transmittance. A percentage transmittance of 100 would mean that all of that frequency passed straight through the compound without any being absorbed.

What does the word transmittance mean?

1 : transmission. 2 : the fraction of radiant energy that having entered a layer of absorbing matter reaches its farther boundary.