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

Dust is particulate matter.
The room is made of matter. That matter generates dust.
Unless the room is completely made of a very tough material and vacuum sealed, dust will form.