What is a perspective of sound intensity

The answer already written by Hmm92 is pretty good, and it's correct as far as it goes.  

But that word "perspective" is bothering me.  It's not used correctly in the question, and we're left to wonder just what you're actually looking for.

My hunch is that you meant to ask for the "perception" of sound intensity.  That is, you want to know how we perceive different intensities of sound.

If that's what you're going for, then it's simply the "loudness" of what we're hearing.

If I'm right, then I'm glad I could help.  If I'm wrong, then that's OK.  Just ignore it, and maybe a Mod can delete my answer and cancel the points I received for it.  All I did anyway was invent a question, and then answer my own question that I invented.