transmissivityn.
/trɑːnzmɪˈsɪvɪti//tranzmɪˈsɪvɪti//trɑːnsmɪˈsɪvɪti//transmɪˈsɪvɪti/ Physics.
The degree to which a medium allows electromagnetic radiation to pass through it.
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transmissivity1913
1913 Electr. World 30 Aug. 426/2 The connection between cloudiness and transmissivity.
1928 Proc. Royal Soc. A. 122 314 The transmissivity of the telescope could then be calculated.
1946 Nature 21 Sept. 422/2 The optical efficiency, that is, the sum of the reflectivity and transmissivity, expressed as a percentage of the incident light intensity, is practically 100 for the interference films, owing to the negligible absorption.
1971 Sci. Amer. Sept. 89/1 The flux of solar radiation received at the ground is highly variable..because of the variable transmissivity of the atmosphere and the changing degree of cloudiness.
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).
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n.1913