the flow rate of sound energy through a set area and is measured in watts per metre squared. It is seldom directly measured. According to this, sound intensity is proportional to the square of sound pressure,

SOUND INTENSITY: "Sound intensity is in proportion to the sound pressure."
Cite this page: N., Pam M.S., "SOUND INTENSITY," in, April 13, 2013, (accessed April 16, 2021).