Chemistry term referring to the combining capacity of an atom or group of atoms.
The valence of carbon is 4.
この元素は価数が2なので、酸素と結合しやすい。
This element has a valence of 2, so it readily bonds with oxygen.
color rendering index; CRI
Compound of 価 (ka, 'value') and 数 (sū, 'number'), referring to the numerical value of combining capacity.