Molecular Diffusion - an overview | ScienceDirect Topics
Molecular diffusion is a fundamental physical process, caused by the random motion of molecules in gases and liquids, occurring even in completely stagnant conditions. The effect of this random motion is to reduce gradients in concentration, leading eventually to an even distribution of, for example, dissolved chemicals in water.
12.4: Molecular Diffusion - Chemistry LibreTexts
Molecular diffusion is the thermal motion of molecules at temperatures above absolute zero. The rate of this movement is a function of temperature, viscosity of the fluid and the size and shape of the particles.
Diffusion - Definition, Examples and Types | Biology Dictionary
2019年10月4日 · Diffusion is a physical process that refers to the net movement of molecules from a region of high concentration to one of lower concentration. The material that diffuses could be a solid, liquid or gas.
12.7 Molecular Transport Phenomena: Diffusion, Osmosis, and …
Diffusion is the movement of substances due to random thermal molecular motion. Fluids, like fish fumes or odors entering ice cubes, can even diffuse through solids. Diffusion is a slow process over macroscopic distances.
12.7: Molecular Transport Phenomena- Diffusion, Osmosis, and …
Diffusion is the movement of substances due to random thermal molecular motion. The average distance \(x_{rsm}\) a molecule travels by diffusion in a given amount of time is given by \[ x_{rsm} = \sqrt{2Dt},\] where \(D\) is the diffusion constant, …
5.6: Passive Transport - Diffusion - Biology LibreTexts
2023年10月31日 · Diffusion is a process of passive transport in which molecules move from an area of higher concentration to one of lower concentration.
9.7: Molecular Effusion and Diffusion - Chemistry LibreTexts
2021年8月13日 · Diffusion is the gradual mixing of gases to form a sample of uniform composition even in the absence of mechanical agitation. In contrast, effusion is the escape of a gas from a container through a tiny opening into an evacuated space.
1.4: Diffusion and Osmosis - Biology LibreTexts
2023年7月12日 · Diffusion is the movement of molecules from an area in which they are high in concentration to an area in which they are low in concentration. Molecules move down a concentration gradient until they are equally distributed, or equilibrium is reached (Fig. 1).
12.9: Diffusion - Physics LibreTexts
Molecular diffusion, often called simply diffusion, is the thermal motion of all (liquid or gas) particles at temperatures above absolute zero. The rate of this movement is a function of temperature, viscosity of the fluid and the size (mass) of the particles.
1.9: Diffusion - Chemistry LibreTexts
The flux \ (\mathrm {J}\) can be given in units of atoms \ (/ \mathrm {cm}^2 \mathrm {~s}\), moles/ \ (\mathrm {cm}^2 \mathrm {~s}\), or equivalents. Correspondingly, the diffusivity (D) will assume the dimensions \ (\mathrm {cm}^2 / \mathrm {s}\), as can be seen from a dimensional analysis:
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