Läpöisykerroin
Läpäisykerroin, in English often called the transmission coefficient, is a dimensionless quantity that describes how easily a barrier or interface allows a certain phenomenon to pass through. It represents the fraction or probability that the incident quantity, such as light, heat, a chemical species, or particles, is transmitted rather than reflected or absorbed. The exact meaning and calculation depend on the context and the quantity considered.
In optics and radiative transfer, the läpäisykerroin refers to the fraction of incident electromagnetic radiation that
In membrane science and diffusion theory, the term describes how readily a substance permeates a barrier. Here
In quantum mechanics, a similar coefficient—the transmission probability—gives the likelihood that a particle will tunnel through
Measurement and interpretation of läpäisykerroin require specifying the context, quantities involved, and often the geometry of