intensity

the average amount of sound power (sound energy per unit time) transmitted through a unit area in a specified direction. The unit of intensity is watts per square meter. For simplicity, the magnitude of the intensity is often referred to as the intensity, without specifying the direction in which the sound is traveling.

Glossary: equal loudness curve
Glossary: shadow zone
Glossary: source level
Glossary: spectrogram
Glossary: threshold of hearing
Glossary: bel
Glossary: sound intensity level
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Glossary: waveform