What is "P1" or "P" in…........

m zahid · March 12, 2016, 05:03

hi, I want to know about the meaning of term “P1” or "P" in P1 radiation model. Is P stand for pressure? if anybody know please share for knowledge.
Thanks

LuckyTran · March 13, 2016, 02:26

P-1 is the simplest of the P-N approximations (taking only the lowest order terms) with P-2 and P-3 being higher order approximations to the radiation intensity.

The P is mostly notational and has a confusing history. It could refer to the spherical harmonics or it could also be related to notation commonly used for the Legendre polynomials. Which came first? I don't know. But the P does not have any important meaning, it's historical/convention.

March 12, 2016, 05:03	What is "P1" or "P" in…........	#1
m zahid Member Qureshi M Z I Join Date: Sep 2013 Posts: 81 Rep Power: 13	hi, I want to know about the meaning of term “P1” or "P" in P1 radiation model. Is P stand for pressure? if anybody know please share for knowledge. Thanks

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March 13, 2016, 02:26		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,751 Rep Power: 66	P-1 is the simplest of the P-N approximations (taking only the lowest order terms) with P-2 and P-3 being higher order approximations to the radiation intensity. The P is mostly notational and has a confusing history. It could refer to the spherical harmonics or it could also be related to notation commonly used for the Legendre polynomials. Which came first? I don't know. But the P does not have any important meaning, it's historical/convention.