A Very Useful Formula
On the last page, every time we multiplied distance by 10, the time to diffuse increased 100-fold!
10 x as far --> 100 x as much time
What’s going on here? If time to diffuse were directly proportional to distance, then 10 times the distance would require 10 times as long -- not 100. This overinflation is like if you went to McDonald’s to buy 10 hamburgers and they charged you 100 times (not 10 times) the price of a single hamburger. Not fair? Well, at least it's not directly proportional variation.
photo credits: mcDonalds
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