Your nose is like an iceberg: Most of it is hidden beneath the surface of your face. Only the very tip actually pokes out. The total volume of a nasal cavity is about 15-20 cubic centimeters, slightly bigger than a tablespoon.
The nose can produce a lot of mucus – in fact, normally people produce about a quart of mucus per day (almost 3 soda cans). Most of this slides into the throat and gets swallowed, but when you have a cold mucus gets thicker and stickier, and inflammation makes it less likely to go down the back so some of it comes out the front instead.
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