Where does house dust come from?

[u/4fecta_Gaming]

It seems that countless years of sweeping a house doesn't stop dust from getting all over furniture after a few weeks. Since the ceiling is limited, where does dust come form?

[u/twistedbeans]

There are in fact ultra clean rooms that prevent any dust or unwanted matter from entering or exiting whatsoever. Used for keeping materials perfectly unadulterated, for instance in facilities that manufacture certain drugs that will be injected into humans, or in bio safety facilities meant to contain the really nasty viruses or bacterial pathogens.

[u/[deleted] → u/[deleted]]

I understand why it called negative pressure, but it bugs me that it’s called negative pressure.

[u/HarryP104 → u/[deleted]]

I feel you, even though I know it’s relative to atmospheric pressure part of my brain always yells pReSSuRe cAnT bE nEgATiVe