How does dust get everywhere?

Question

You go into a room that hasn’t had folks in it for 10 years and there is dust everywhere. I thought it was skin cells but obviously not.

Even rooms with no access to the outside have dust.

In: Mathematics

Answer 1

Even if you seal a room and open after a few years, you will have a layer of dust. This all the dust in the now still air which floats and settles down.