Applications of Diffusion is of fundamental significance in many disciplines of mechanical, electronics, chemistry, and biology. Some example applications of diffusion:
-  Sintering to make solid materials (powder metallurgy, production of ceramics) 
-  Chemical reactor design 
-  Catalyst design in chemical industry 
-  Steel can be diffused (e.g., with carbon or nitrogen) to change its properties 
-  Doping during productions of semiconductors