Difference between bulk diffusuin and molecular diffusion
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Molecular diffusion often called simply diffusion, is the thermal motion of all particles at temperatures above absolute zero. The rate of this movement is a function of temperature, the viscosity of the fluid and the size of the particles. Diffusion explains the net flux of molecules from a region of higher concentration to one of lower concentration, but diffusion also occurs when there is no concentration gradient. The result of diffusion is a gradual mixing of material. In a phase with uniform temperature, absent external net forces acting on the particles, the diffusion process will eventually result in complete mixing. Diffusive equilibrium is reached when the concentrations of the diffusing substance in the two compartments become equal. Consider two systems; S1 and S2 at the same temperature and capable of exchanging particles. If there is a change in the potential energy of a system; for example μ1>μ2 an energy flow will occur from S1 to S2, because nature always prefers low energy and maximum entropy. Though the different systems are at equilibrium, there is still water passing through the semipermeable membrane. So if food colouring is put in system A, eventually it would be of equal colour to system B.
bulk diffusion
bulk diffusion is also known as Lattice diffusion. Lattice diffusion is a treatment process that uses heat and chemicals to diffuse an element into a gemstone to artificially change its colour. Lattice diffusion treated sapphires can be any colour.
Molecular diffusion often called simply diffusion, is the thermal motion of all particles at temperatures above absolute zero. The rate of this movement is a function of temperature, the viscosity of the fluid and the size of the particles. Diffusion explains the net flux of molecules from a region of higher concentration to one of lower concentration, but diffusion also occurs when there is no concentration gradient. The result of diffusion is a gradual mixing of material. In a phase with uniform temperature, absent external net forces acting on the particles, the diffusion process will eventually result in complete mixing. Diffusive equilibrium is reached when the concentrations of the diffusing substance in the two compartments become equal. Consider two systems; S1 and S2 at the same temperature and capable of exchanging particles. If there is a change in the potential energy of a system; for example μ1>μ2 an energy flow will occur from S1 to S2, because nature always prefers low energy and maximum entropy. Though the different systems are at equilibrium, there is still water passing through the semipermeable membrane. So if food colouring is put in system A, eventually it would be of equal colour to system B.
bulk diffusion
bulk diffusion is also known as Lattice diffusion. Lattice diffusion is a treatment process that uses heat and chemicals to diffuse an element into a gemstone to artificially change its colour. Lattice diffusion treated sapphires can be any colour.
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