透とう過か率りつ

noun

transmittance; permeability

Technical term used in physics, optics, and materials science to describe the fraction of light, radiation, or a substance that passes through a medium.

• このガラスの透とう過か率りつは90%以い上じょうです。

  The transmittance of this glass is over 90%.

• フィルムの透とう過か率りつを測そく定ていする。

  Measure the permeability of the film.