00:01
So the best way to go around this is first off to calculate the concentration gradient of this system here.
00:11
And again we have a concentration of the surface and below the surface of 1 .15 cm below the surface.
00:19
So therefore if we get the difference, we divide all that by 0 .15, we're going to get approximately 4 .13 % per cm.
00:35
So therefore from there we can even find, go ahead and find the diffusion flux at the surface of the road because again we just need to use a fick's law of diffusion where j equals to minus d multiplied by dc dx.
00:57
In this case j is the diffusion flux.
01:00
Capital d is the diffusivity of carbon in steel.
01:04
Dc dx is the concentration of gradient in this case.
01:09
Diffusivity is basically 5 .7 into 10 to minus 5 cm per second.
01:17
The concentration gradient, remember, is 4 .13 we determined...