Question

What is diffusion

Answer 1

https://www.google.com/search?source=hp&ei=IUbwXNGiAoaWsAX895yABw&q=diffusion+definition&oq=diffusion&gs_l=psy-ab.1.1.0l3j0i131j0l6.2920.7782..11277...1.0..0.362.1547.0j9j0j1......0....1..gws-wiz.....0..0i10.gAoTUuJLF58