Transmittance vs. Transmissivity

Transmittancenoun

a transmission

Transmissivitynoun

(physics) A measure of the capacity of a material to transmit radiation (the ratio of the amounts of energy transmitted and received)

Transmittancenoun

(physics) the fraction of incident light, or other radiation, that passes through a substance

Transmissivitynoun

(geology) A measure of the capacity of a saturated aquifer to transmit water horizontally. SI units: m²/s. Symbol: T.

Transmittancenoun

Transmission.

Transmittancenoun

the fraction of radiant energy that passes through a substance

Transmittance

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.Internal transmittance refers to energy loss by absorption, whereas (total) transmittance is that due to absorption, scattering, reflection, etc.