conservation of mass

• Principe scientifique fondamental selon lequel la masse ne peut être ni créée ni détruite dans un système fermé au cours de processus chimiques ou physiques ordinaires ; elle ne peut que changer de forme.

A fundamental scientific principle stating that mass cannot be created or destroyed in a closed system through ordinary chemical or physical processes; it can only change forms.

1. Physical LawB2formal

   A fundamental principle of physics stating that mass cannot be created or destroyed in a closed system through ordinary chemical or physical changes.

   conservation de la masse

   • The conservation of mass explains why the total weight of the reactants equals the total weight of the products in a chemical reaction.
   • According to the conservation of mass, the amount of matter remains constant during a phase change.
   • Students learn about the conservation of mass in introductory chemistry classes.