質しつ量りょう保ほ存ぞんの法ほう則そくしつりょうほぞんのほうそくMeanings1nounlaw of conservation of massScientific term used in physics and chemistry. States that mass is neither created nor destroyed in a closed system.化か学がく反はん応のうでは、質しつ量りょう保ほ存ぞんの法ほう則そくが成なり立
