based on the information presented in the introduction of this problem, what is a sound wave?

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Based on the information presented in the introduction of this problem, what is a sound wave?

Propagation of sound particles that are different from the particles that comprise the medium

Propagation of energy that does not require a medium

Propagation of pressure fluctuations in a medium

Propagation of energy that passes through empty spaces between the particles that comprise the medium

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