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Sound intensity I is a measure in W/m² that is a energy quantity of sound.

Loudness is the quality of a sound that is the primary psychological correlate of physical strength. Better use the sound pressure in pascals (Pa = N/m²) because this sound field quantity makes the effect of moving our ear drums.

Measuring intensity and feeling the loudness does not relate good. Perceived loudness varies from person to person and cannot be measured this way.

A A-weighting filter attempts to adjust sound measurements to correspond to loudness as perceived by the average human.

Units used trying to measure loudness are Sone (loudness N) and Phon (loudness level L).

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