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Index Kinetic theory concepts Applications of kinetic theory Fluid concepts | |||||
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Rate of DiffusionSince the average kinetic energy of different types of molecules (different masses) which are at thermal equilibrium is the same, then their average velocities are different. Their average diffusion rate is expected to depend upon that average velocity, which gives a relative diffusion rate where the constant K depends upon geometric factors including the area across which the diffusion is occuring. The relative diffusion rate for two different molecular species is then given by |
Index Kinetic theory concepts Applications of kinetic theory Fluid concepts | ||
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Index Kinetic theory concepts Applications of kinetic theory Fluid concepts | |||||
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Index Kinetic theory concepts Applications of kinetic theory Fluid concepts | |||||
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Index Kinetic theory concepts Applications of kinetic theory Fluid concepts | |||
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Membrane TransportThe transport of water and other types of molecules across membranes is the key to many processes in living organisms. Many of these transport processes proceed by diffusion through membranes which are selectively permeable, allowing small molecules to pass but blocking larger ones. These processes, including osmosis and dialysis, are sometimes called passive transport since they do not require any active role for the membrane. Other types of transport, called active transport, involve properties of the membrane to selectively "pump" certain types of molecules across the membrane. The transport of gases across membranes depends upon diffusion and the solubility of the gases involved. In life science applications such transport is characterized by Graham's Law and Fick's Law. |
Index Kinetic theory concepts Applications of kinetic theory Fluid concepts | ||
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