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Gas exchange is the physical process by which gases move passively by diffusion across a surface. For example, this surface might be the air/water interface of a water body, the surface of a gas bubble in a liquid, a gas-permeable membrane, or a biological membrane that forms the boundary between an organism and its extracellular environment.
The gas leaving the container is somewhat enriched in the lighter molecules, while the residual gas is somewhat depleted. A single container wherein the enrichment process takes place through gaseous diffusion is called a diffuser. Uranium hexafluoride. UF 6 is the only compound of uranium sufficiently volatile to be used in the gaseous ...
Gas exchange in cutaneous respiration is controlled by three factors: [2] Ventilation: the rate of delivery of respiratory medium (water or air) to the respiratory surface; Diffusion: the passage of gases through the skin; Convection: the carrying of dissolved gases towards or away from the lungs
In very small animals, plants and bacteria, simple diffusion of gaseous metabolites is sufficient for respiratory function and no special adaptations are found to aid respiration. Passive diffusion or active transport are also sufficient mechanisms for many larger aquatic animals such as many worms, jellyfish, sponges, bryozoans and similar ...
Insects were once believed to exchange gases with the environment continuously by the simple diffusion of gases into the tracheal system. More recently, however, large variation in insect ventilatory patterns has been documented and insect respiration appears to be highly variable.
Gaseous diffusion, used for isotope separation; Heat equation, diffusion of thermal energy; Itō diffusion, mathematisation of Brownian motion, continuous stochastic process. Knudsen diffusion of gas in long pores with frequent wall collisions; Lévy flight; Molecular diffusion, diffusion of molecules from more dense to less dense areas
The K-25 building became the blueprint for four other massive plants at the site – K-27, K-29, K-31 and K-33 – and gaseous diffusion plants in Paducah, Kentucky, and Portsmouth, Ohio.
The self-diffusion coefficient of neat water is: 2.299·10 −9 m 2 ·s −1 at 25 °C and 1.261·10 −9 m 2 ·s −1 at 4 °C. [2] Chemical diffusion occurs in a presence of concentration (or chemical potential) gradient and it results in net transport of mass. This is the process described by the diffusion equation.