conservation of mass


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Related to conservation of mass: law of conservation of mass

Conservation of mass

The notion that mass, or matter, can be neither created nor destroyed. According to conservation of mass, reactions and interactions which change the properties of substances leave unchanged their total mass; for instance, when charcoal burns, the mass of all of the products of combustion, such as ashes, soot, and gases, equals the original mass of charcoal and the oxygen with which it reacted.

The special theory of relativity of Albert Einstein, which has been verified by experiment, has shown, however, that the mass of a body changes as the energy possessed by the body changes. Such changes in mass are too small to be detected except in subatomic phenomena. Furthermore, matter may be created, for instance, by the materialization of a photon (quantum of electromagnetic energy) into an electron-positron pair; or it may be destroyed, by the annihilation of this pair of elementary particles to produce a pair of photons. See Electron-positron pair production, Relativity

conservation of mass

[‚kän·sər′vā·shən əv ′mas]
(physics)
The notion that mass can neither be created nor destroyed; it is violated by many microscopic phenomena.
References in periodicals archive ?
The foundation of COSMO is based on a formulation of the three conservation equations: conservation of mass, energy, and momentum.
However, it is crucial that children are given the opportunity to question the principle of conservation of mass, as the visual representations children form from these experiences can be called upon in later years.
From the conservation of mass the density is proportional to the inverse of the cubic scale factor:
I trust he meant conservation of mass and energy together.
Both methods are rooted in balanced chemical equations as prescribed by Lavoisier's conservation of mass law.
Conservation of mass states that, for a steady state application, the mass going in a system should be equal to the mass going out.
This calculator works under the theory of conservation of mass and the assumptions that (i) molten solder droplet deforms into a truncated sphere and a double truncated sphere, respectively, when it comes into contact with a planar substrate and sandwich between two planer substrates and (ii) the densities of the starting solder bump and the ending solder joint remain the same (i.
The reason for this is that the global kinematics is largely determined by the conservation of mass rather than the conservation of momentum (36-40).
Had Coble studied physics, he would know of the law of conservation of mass, which states that you can neither create nor destroy mass - you can only change its form.
The local gapwise average velocity profile at the die exit was calculated at 1 mm intervals using conservation of mass from the measured profile of the extruded part and the profile of the die opening.

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