How is loudness associated with intensity quantified?

Loudness is primarily associated with the perception of sound intensity, which is quantified using decibels (dB). The decibel scale measures the intensity of sound in a logarithmic form, reflecting how humans perceive changes in loudness more accurately than a linear scale would. This means that a change of a few decibels can represent a significant perceived difference in loudness.

In the context of sound, intensity refers to the power carried by sound waves per unit area and is related to the amplitude of the sound wave. However, amplitude itself is not a unit of measurement for loudness; rather, it is a physical property of the sound wave. Additionally, Hertz (Hz) measures frequency, which relates to the pitch of a sound rather than its loudness. Therefore, decibels are the appropriate unit for quantifying loudness in relation to intensity.