We could just give the (maximum) amplitude of the fluctuation but what is usually done is to report the rms value which is the square root of the average of the squares of the amplitude. In the chart ...We could just give the (maximum) amplitude of the fluctuation but what is usually done is to report the rms value which is the square root of the average of the squares of the amplitude. In the chart below the root mean square (rms) variation in pressure from normal atmospheric pressure (in pascals Pa), the sound intensity level (SIL in dB) and the intensity (I in W/m2) are given for several sounds.
