transmittance(redirected from transmittances)
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1. A transmission.
2. Physics The ratio of the radiant energy transmitted to the total radiant energy incident on a given body.
1. the act of transmitting
2. (General Physics) physics Also called: transmission factor a measure of the ability of anything to transmit radiation, equal to the ratio of the transmitted flux to the incident flux; the reciprocal of the opacity. For a plate of material the ratio of the flux leaving the entry surface to that reaching the exit surface is the internal transmittance. Symbol: τ Compare reflectance, absorptance
trans•mit•tance(trænsˈmɪt ns, trænz-)
Physics. the ratio of the radiant flux transmitted through and emerging from a body to the total flux incident on it: equivalent to 1 minus the absorptance.