diffusion of gases

diffusion of gases

a natural process, essential in respiration, in which molecules of a gas pass from an area of high concentration to one of lower concentration.
References in periodicals archive ?
Gas particle interchange as a result of Brownian motion contributes to the diffusion of gases in the respiratory tract.
Diffusion of gases is emphasized in this representation, and it is important to note that gases, like liquids, diffuse from regions of greater to lesser concentration.
The products can control the environment inside the packaging bags and prevent the diffusion of gases such as oxygen, carbon dioxide and ethylene.
These two specific welding defects formation are generally assumed to be caused by diffusion of gases that are introduced, during welding process, in melted metals bath or to gases being in base materials from other manufacturing processes.
One key feature of the technology is enhanced barrier to diffusion of gases, such as oxygen and carbon dioxide.
Moisture migration, solubility of gases, diffusion of gases, yeast, and drying and condensation are discussed in a chapter dedicated to frozen doughs.
Shortly thereafter, Michael Faraday and Thomas Graham, two scientific pioneers known primarily for their work with electricity and diffusion of gases, respectively, contributed further to the analysis of nanoparticulate suspensions, i.
The first term changes with time because of outwards diffusion of gases inside the cells and inwards diffusion of air; this leads to a worsening of insulating properties with time, which is known as thermal ageing and represents one of the major drawbacks of the use of those materials.
However, it has been shown that both in the case of the diffusion of gases in solid polymers (33) and in molten polymers (30) diffusivity does not depend on the viscosity of the polymer but rather on the size of the gas molecule and on the monomer type and structure.
Effective medium theories, formulated in terms of the activation energy for diffusion in the amorphous region, are applicable to diffusion of gases in heterogeneous polymers.
In Eq 1 the contributions of solid conduction and radiation are constant with time, while the contribution of gas conduction, which represents at least 50% of the total thermal conductivity, changes with time because of outward diffusion of gases inside the cells and inward diffusion of air.

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