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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What humans interpret as sound is pressure waves moving through a medium

Those pressure waves move it different speeds depending on the medium in question.

A medium that is more dense will transmit sound more quickly up to a certain extent.

For example water is much more dense than air but not so dense as to block the pressure wave itself so sound travels much faster through water than it does through air.

Quieter sounds do not go as far because the pressure waves that they create are not as strong and therefore dissipate more quickly.

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