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It starts our associating p with both pressure and SPL, which is nutty. It probably needs U, the volume velocity, or velocity times surface area. Its history is complicated, and it includes concepts I'm not familiar with, like SVL, SIL, SWL, so I hesitate to jump in. Are these really sound measurement things? I see no sources on the linked pages for SVL, SIL, etc. Dicklyon (talk) 19:37, 4 May 2013 (UTC)