無む次じ元げん量りょう

noun

dimensionless quantity

Technical term in physics for a quantity without physical units, such as the Reynolds number or refractive index.

• レイノルズ数すうは流りゅう体たい力りき学がくで使つかわれる無む次じ元げん量りょうの一ひとつです。

  The Reynolds number is one of the dimensionless quantities used in fluid dynamics.