What is the measurement unit for sound intensity?

The measurement unit for sound intensity is the decibel. This unit quantifies the intensity of sound in a logarithmic scale, allowing for the comparison of sound levels. The decibel scale is particularly useful because it reflects the human perception of sound, where an increase of about 10 decibels corresponds to approximately a doubling of perceived loudness.

Hertz, on the other hand, measures frequency, which is distinct from intensity, focusing on how many sound waves occur per second. Kelvin is a unit of temperature, unrelated to sound measurements. Watt is a unit of power, which can relate to sound in terms of energy but is not the standard measure of sound intensity itself. Therefore, the decibel is the most appropriate and recognized unit for sound intensity measurement.