The Weber Fraction for loudness is 1/20. So let's say I get you to listen to some music played at 100 decibels. In order for you to tell that a second piece of music was louder, I would need to play it at

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The Weber Fraction for loudness is 1/20, meaning a change in loudness is perceivable when there is at least a 1/20 (or 5%) increase from the original level. Therefore, to perceive a difference from 100 decibels, the sound needs to be increased by 5% of 100, which is 5 decibels, making the new level 105 decibels.

The Weber Fraction for Loudness Is 1/20