Definition of conservation of mass in US English:

conservation of mass


  • A principle stating that mass cannot be created or destroyed.

    • ‘Collisions of this kind would appear to violate the first law of thermodynamics, the conservation of mass and energy.’
    • ‘To put it another way, how can the nonphysical give rise to the physical without violating the laws of conservation of mass, of energy and of momentum?’
    • ‘In accordance with the conservation of mass, one would predict that the power law in some other part of the channel must exceed one-half to balance the decrease seen at the wall.’
    • ‘Or do those calculations of yours freely infringe the law of conservation of energy but have scruples about the conservation of mass?’
    • ‘Balanced chemical equations reflect the law of conservation of mass.’