As the grain size decreases, SV increases and the hydrogen mobility will increase as a function of increasing grain boundary area. The simulation results indicate that diffusion along grain boundaries can play an important role in the overall diffusion process.

The mismatch of the orientation of neighboring grains leads to a less efficient atomic packing within the grain boundary. Hence the atoms in the boundary have a less ordered structure and a slightly higher internal energy.

Due to the high concentration of defects in the grain contact area resulting from their crystallographic misalignment, diffusive transfer along the grain boundaries occurs much faster than in their bulk, where the defect concentration is much smaller (bulk diffusion), but slower than in the boundary between the solid …

In general, surface diffusion occurs much faster than grain boundary diffusion, and grain boundary diffusion occurs much faster than lattice diffusion.

Due to experimental constraints most studies of surface diffusion are limited to well below the melting point of the substrate, and much has yet to be discovered regarding how these processes take place at higher temperatures.

Diffusion in gases is quick because the particles in a gas move quickly. It happens even faster in hot gases because the particles of gas move faster.

Temperature: Higher temperatures increase the energy and therefore the movement of the molecules, increasing the rate of diffusion. Lower temperatures decrease the energy of the molecules, thus decreasing the rate of diffusion. Solvent density: As the density of a solvent increases, the rate of diffusion decreases.

Diffusion can take place in gases, liquids, or solids. In solids, particularly, diffusion occurs due to thermally-activated random motion of atoms – unless the material is at absolute zero temperature (zero Kelvin), individual atoms keep vibrating and eventually move within the material.

If you write something on the blackboard &leave it uncleaned for a longer time you will find difficult to claean the blackboard afterwards. this is because of the diffusion of chalk particles into the blackboard. Gold and lead can diffuse into each other by contacting.

This movement or spreading out is due to the fact that in liquids the particles are moving randomly. Diffusion in gases: When two or more different gases, like oxygen and nitrogen are mixed they will mix themselves evenly. We call this mixing of particles diffusion. This is due to the random movement of particles.

Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. Diffusion happens in liquids and gases because their particles move randomly from place to place. Diffusion is an important process for living things; it is how substances move in and out of cells.

Gas can be diffused in a liquid state. Carbon dioxide and oxygen are the two gases in air which dissolves in water by diffusion.

Molecular diffusion, often simply called diffusion, is the thermal motion of all (liquid or gas) particles at temperatures above absolute zero. The result of diffusion is a gradual mixing of material such that the distribution of molecules is uniform.

Diffusion in Liquids: Solids gases and liquids can diffuse into liquids. The rate of diffusion is higher in liquids than that of solids. This is due to the fact that in the liquid state, particles move freely and have greater space between each other as compared to particles in the solid state.

The molecules of gas have more kinetic energy than liquid molecules and are smaller. The distance between the constituent particles in gases becomes greater than in liquids, resulting in diffusion faster in gases than in liquids. Therefore, gas particles have higher kinetic energy and travel more rapidly.

Answer. The process of diffusion occurs rapidly in gasses less rapidly in liquid and very slow in solids due to their arrangement of particles and kinetic energy. Gasses are far from each other and have more kinetic energy as compared to liquids and solids that’s why diffusion occurs rapidly.

Diffusion occurs quickly in a gas than in a liquid because the space between the constituent particles in gases are higher than in liquids. Thus particles in gas possess higher kinetic energy and move with higher speeds.

The factor that does not affect the rate of diffusion are the electrical charges of the diffusion particles. The electrical charges do not participate in such processes.

For example, a solid may become a liquid. This phase change is called melting. When a solid changes into a gas, it is called sublimation. When a gas changes into a liquid, it is called condensation.