noun
characteristic value; figure of merit
Technical term used in chemistry and materials science to describe a numerical value that represents a physical or chemical property of a substance, such as acid value or iodine value.
この油脂の示性値から、その品質を評価できる。
From the characteristic value of this oil, its quality can be evaluated.
示性値として、酸価やヨウ素価がよく用いられる。
As characteristic values, acid value and iodine value are often used.
Compound of 示 (し, 'to show, indicate') + 性 (せい, 'property, nature') + 値 (ち, 'value'). The term is a technical coinage for a numerical index that indicates a specific property.