Eli5: Does all sound travel at exactly the speed of sound? If so why?

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Do quieter sounds travel at the same speed but for less distance?

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Almost, yes. Normal volumes of sound are ‘carried’ by the natural movement of air molecules. In solids and liquids they are like vibrations in a set of springs and weights, their speed controlled by the strength of the springs and mass of the weights.

Only in extremely loud cases does this change in air. The sound can correspond to so much particle motion that it actually does travel faster.

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