the.com/transmittance
How much light actually makes it through, no excuses, no vibes, just a ratio.
means The fraction of light (or other radiant energy) that passes through a material, expressed as a ratio of transmitted to incident light.
from Built from the Latin verb transmittere — trans- 'across' plus mittere 'to send' — the same root that gives English 'transmit.' The -ance suffix turns the act into a measurable quantity, a pattern borrowed from older physics terms like 'resistance' and 'conductance,' which similarly convert a verb into a number you can put on a dial.
- formula
- transmitted light divided by incident light
- range
- 0 to 1, or 0% to 100%
- inverse cousin
- absorbance, which hogs the spotlight in chemistry
- not linear
- absorbance is log-based, transmittance isn't