Diffusion equation: time for an element to diffuse at set distance

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SUMMARY

The discussion focuses on determining the appropriate equation to calculate the time for an element to diffuse over a specified distance in microns. The two equations in question are X = sqrt(DT) and X = sqrt(2DT). The user, James, seeks clarification on the conditions under which each equation should be applied, indicating a need for a deeper understanding of diffusion processes.

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jblakes
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Good morning,

I'm trying to workout the time for an element to diffuse at set distance in microns.

I have the distance, the diffusion coefficient, just unsure which equation I actually use.

X= sqrt DT or the other one x= sqrt 2DT.

I can't seem to figure out when you use one and not the other.

Thanks in advance
James
 
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jblakes said:
Good morning,

I'm trying to workout the time for an element to diffuse at set distance in microns.

I have the distance, the diffusion coefficient, just unsure which equation I actually use.

X= sqrt DT or the other one x= sqrt 2DT.

I can't seem to figure out when you use one and not the other.

Thanks in advance
James
What is the exact situation you are looking at?
 

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