# Acoustic wave equation – Wikipedia, the free encyclopedia

Richard Feynman[3] derives the wave equation that describes the behaviour of sound in matter in one dimension (position x) as:

{ \partial^2 p \over \partial x ^2 } – {1 \over c^2} { \partial^2 p \over \partial t ^2 } = 0

where p is the acoustic pressure (the local deviation from the ambient pressure), and where c is the speed of sound.

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