Sound intensity

Loudness is a measure of the acoustic energy of a sound. The higher the sound intensity, the louder the sound. The sound intensity is noted I and is expressed in watts per square meter (Wm-2). The sound intensity depends on several parameters: 1. the sound intensity at the transmitter 2. the distance from the receiver to the sound source 3. the presence of obstacles which absorb or reflect the sound waves We can measure the sound intensity with a sound level meter, like the FizziQ app, a device that converts sound energy into a measurable electrical signal.