Give an example of diffusion in the outside world.

An example of diffusion in the outside world:

the spread of odors by plants, insects, animals, giving certain signals to the surrounding inhabitants;
caking and accretion of minerals that are in contact for a long time;
the formation of mineral waters containing various trace elements, dissolved from the earth’s soil;
creation of alloys with the required properties by adding impurities to the metal;
the formation of smog over the city;
painting of fabrics, surfaces of solids;
aromatization and coloring of drinks;
salting fish, meat, vegetables when canning.