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What is the difference between sound power and sound pressure?

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What is the difference between sound power and sound pressure?

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  1. Sound (or acoustic) pressure is the change in pressure caused by a sound (acoustic) wave.  Sound power (or acoustic energy) is the amount of energy contained in a sound (acoustic) wave.

    It's unfortunate that the terms 'power' and 'energy' get so badly intermixed in acoustics.  They really aren't the same thing at all.  Energy is the capacity to 'do' something.  Power is the amount of energy used (or generated) per unit of time.

    HTH,

    Doug

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