noun
Technical term used in chemistry and related fields to describe how readily a substance vaporizes.
この溶剤は揮発度が高いので、換気に注意してください。
This solvent has high volatility, so please be careful with ventilation.
Compound of 揮発 (volatilization) and 度 (degree). The exact historical derivation is uncertain, but the term is a modern technical coinage.