conservation of mass

Noun

 * 1)  A conservation law of classical physics that states that the total mass of a closed system remains constant regardless of the chemical or physical changes that take place within it.

Translations

 * Catalan: conservació de la massa
 * Danish: massebevarelse
 * Finnish: aineen häviämättömyys
 * German: Massenerhaltung
 * Romanian: conservarea masei, conservare a masei