This is looking great, and much more appropriate considering the feedback from the survey.
A few comments:
I feel towards the beginning the law of chemical potential could be displayed/described
In the materials section, perhaps the difference between sieverts and henry could be specified and in which case you would use them for people who arn't aware of them
@jhdark I have completely modified task 3.
I kept the multi-material aspect of it but applied it to a real world example: permeation barriers.
Let me know what you think please