* Probability density* may refer to:

- Probability density function in probability theory
- The product of the probability amplitude with its complex conjugate in quantum mechanics

According to quantum mechanics, these two are the same thing.

### Famous quotes containing the word probability:

“Liberty is a blessing so inestimable, that, wherever there appears any *probability* of recovering it, a nation may willingly run many hazards, and ought not even to repine at the greatest effusion of blood or dissipation of treasure.”

—David Hume (1711–1776)

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