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 Originally Posted by Pascal
Why does stuff still smell even like 3 days later (like curry on a plate)? Doesn't the smell disappear into the air? Where is the smell coming from
The human sense of smell is sensitive to several parts per billion. Which means that only a few molecules of 'stink' per every billion molecules of air can be smelled by an average human's sense of smell. Microscopic particles can remain suspended in the air for a surprisingly long time. Dust from the Sahara makes its way to South America.
Even after you wash something, most anti-bacterial soaps /sanitizers claim to kill 99.99% of germs. So that leaves about 1 part per ten thousand... which is a over a thousand times more than necessary for the average person's nose to smell.
P.S.  smell disappear
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