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 ?
Does c have the property necessarily being such that it inhabits a world where the law of conservation of mass is true?
The thermal model simulates an icing wind tunnel by calculating particle and air properties using the conservation of mass, momentum and energy equations.
Commercially available simulation software "Fluent 6.3" is incorporated to solve conservation of mass, momentum and energy in the processing of air distribution, and to analyze turbulence affection combined heat transfer on air distribution.
The conservation of mass for the movement of smoke in all shafts is (see Figure 3)
Under the assumptions made above, the conservation of mass, eqn (1)a, is automatically satisfied and the momentum equations for this problem reduce to the dimensionless equation
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.
In a similar manner that conservation of mass links areas and velocities, Bernoulli's equation links velocities and static pressures, when applied to a diffuser or a nozzle.
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.e., the volume remains unchanged).
The conservation of mass is possible because the atoms do not evaporate and are drawn to the nanotube by surface diffusion.
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).

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