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

Houses have small gaps in them, mostly intentional like air bricks and ventilation, otherwise you’d have a lot of mold and really poor air quality.

Air from the outside brings in dust particles into the house, not really noticable normally but a house left for years it will build up.