細さい粒りゅう分ぶん

noun

fine particle fraction; fines

Technical term used in soil mechanics, sedimentology, and materials science for the portion of a granular material consisting of particles smaller than a specified size (often silt and clay).

• この土つちの細さい粒りゅう分ぶんは主おもにシルトと粘ねん土どからなる。

  The fine particle fraction of this soil consists mainly of silt and clay.

• 細さい粒りゅう分ぶんの含がん有ゆう率りつが高たかいと、土つちの透とう水すい性せいが低てい下かする。

  A high content of fines reduces the permeability of the soil.