Definition Of Diffusion Coefficient

From the above definition the diffusion coefficient has units of area per time m 2 s 1 or m 2 s in si units.

Definition of diffusion coefficient. These units are also clear from a dimensional analysis of fick s second law also called the diffusion equation. Dm d grad c df dt. The fick s law in reactor theory stated that. Formally the diffusion coefficient can be understood as parameterizing the area of a spherical surface defined as.

Increasing temperature increases the. It is commonly encountered in physical chemistry equations such as fick s law as well as others. Diffusion coefficient definition is the quantity of a substance that in diffusing from one region to another passes through each unit of cross section per unit of time when the volume concentration gradient is unity called also diffusivity. The rate at which a diffusing substance is transported between opposite faces of a unit.

Ko ĕ fish ent 1. The use of this law in nuclear reactor theory leads to the diffusion approximation. The diffusion coefficient is an important variable in many diffusion equations that describes how quickly one material can diffuse through another material. Diffusion coefficient is the proportionality factor d in fick s law see diffusion by which the mass of a substance dm diffusing in time dt through the surface df normal to the diffusion direction is proportional to the concentration gradient grad c of this substance.

Look it up now. Meaning pronunciation translations and examples. Hence physically the diffusion coefficient implies that the mass of the substance diffuses through a. Diffusion coefficient and the fick s law.

An expression of the change or effect produced by the variation in certain variables or of the ratio between two different quantities. In chemistry a number or figure put before a chemical formula to indicate how many times the formula is to be multiplied.