Diffusion Flashcards
1
Q
what are the two options for diffusion?
A
Liquid or solid diffusion with intermixing of two materials, Self diffusion (eg. H2O molecules moving inside water)
2
Q
What Law can we use when dealing with steady state diffusion?
A
Fick’s First Law
3
Q
what is steady state diffusion?
A
when the rate of diffusion into a system is equal to the rate out of the system.
4
Q
what Law can we used when dealing with transient (non steady) state diffusion?
A
Fick’s Second Law
5
Q
What does diffusivity (D) depend on?
A
Temperature.
6
Q
where is the diffusion rate the fastest?
A
at the surface
7
Q
where is the diffusion rate the medium?
A
Grain boundaries
8
Q
where is diffusion rate the slowest?
A
Bulk (volume)
