There are two main ways to describe how loud a sound is. One is
that you can describe its intensity, I, measured in W/m2, which is
the amount of energy per unit time, per unit area, transported by
the sound. However, this is not very close to the human experience
of sound loudness. The human experience of loudness (actually like
the way most of our senses work) is that each factor of 10 in
intensity sounds like the same sized...