Diffusion Coefficient for gases at different temperatures

In summary, diffusion coefficient is a measure of how easily gas molecules can move through a medium. It is affected by temperature, with higher temperatures leading to a faster diffusion process. The size of gas molecules does not have a significant effect on diffusion coefficient, which is primarily determined by the properties of the medium. Diffusion coefficient can be measured experimentally or calculated using mathematical equations. Understanding diffusion coefficient is important in scientific research, as it helps researchers understand the behavior of gases and make predictions about their movement and interactions.
  • #1
capanni
16
0
Does anyone know figures for Diffusivity (diffusion coefficients) for two gases at different temperatures.

Such as air - Hydrogen or air-methane.

For example the diffusivity of hydrogen into air when the hydrogen is at 300C and the air at 100C.

Please don't point me to Fick's laws unless you can be specific about how these work for the above as, as far as I am aware they are based on gas at the same temperature.
 
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  • #2
No one has any ideas?
How about for the same gas at different temp?
 

What is diffusion coefficient?

The diffusion coefficient is a measure of how easily a gas can move through a medium, such as air or water. It represents the rate at which molecules of a gas will spread out or diffuse from an area of high concentration to an area of low concentration.

How is diffusion coefficient affected by temperature?

In general, as temperature increases, the diffusion coefficient for gases will also increase. This is because higher temperatures cause gas molecules to move faster and collide more frequently, leading to a more rapid diffusion process.

What is the relationship between diffusion coefficient and the size of gas molecules?

The size of gas molecules does not have a significant effect on the diffusion coefficient. This is because the diffusion coefficient is primarily determined by the properties of the medium the gas is moving through, such as temperature and pressure.

How is diffusion coefficient measured?

Diffusion coefficient can be measured experimentally by observing the movement of gas molecules over time in a controlled environment. It can also be calculated using mathematical equations that take into account factors such as temperature, pressure, and molecular weight.

Why is understanding diffusion coefficient important in scientific research?

Diffusion coefficient is an important parameter in many scientific studies, particularly in fields such as chemistry, physics, and environmental science. It can help researchers understand the behavior of gases in different environments and make predictions about how they will move and interact with other substances.

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