transmittance

[trans-mit-ns, tranz-]

trans·mit·tance

[trans-mit-ns, tranz-]
noun
Physics. the ratio of the radiant flux transmitted through and emerging from a body to the total flux incident on it: equivalent to one minus the absorptance.
Also called transmission.


Origin:
1850–55; transmit + -ance

non·trans·mit·tance, noun
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Transmittance is always a great word to know.
So is thermal conductivity. Does it mean:
the amount of heat per unit time per area that can be conducted through a plate of thickness of a given material, differing by one unit of temperature
a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid
Collins
World English Dictionary
transmittance (trænzˈmɪtəns)
 
n
1.  the act of transmitting
2.  physics reflectance Compare absorptance Also called: transmission factor, τ 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

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