Definition of conservation of mass in English:

conservation of mass

Syllabification: con·ser·va·tion of mass

noun

A principle stating that mass cannot be created or destroyed.
More example sentences
  • Collisions of this kind would appear to violate the first law of thermodynamics, the conservation of mass and energy.
  • Balanced chemical equations reflect the law of conservation of mass.
  • Or do those calculations of yours freely infringe the law of conservation of energy but have scruples about the conservation of mass?

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