[meteorite-list] correction to Are Mars Meteorites Magnetic?

[pshugar at messengersfromthecosmos.com]

I have just finished reading an article about Rabies.
IT was near the end when it said that the permeability
of the brain-blood barrier was the key to treating rabies.
Goran mentioned the incorrectness of the term
"permeability".
I now concur with him. 
I shall now endevor to use the term "magnetic
permeability" as this seems to describe what we are trying
to convey.
See his comments below.
Pete


> -------- Original Message --------
> Subject: Re: [meteorite-list] Are Mars Meteorites Magnetic?
> From: Göran_Axelsson <axelsson at acc.umu.se>
> Date: Sat, January 07, 2012 3:36 am
> To: meteorite-list at meteoritecentral.com
> 
> 
> Hi list and everyone!
> 
> Pete, I don't agree with you. permeability is not a good term. If you 
> want to have a correct term then use ferromagnetism.
> 
> Permeability by itself isn't the correct term, you need to use "magnetic 
> permeability" to make it correct because permeability is just a general 
> word and is used in a number of expressions. Permeability is only the 
> term of how easily something flows through something, magnetic fields, 
> fluids, gases, ions in cell membranes...
> For example an achondrite can have a very high permeability for water 
> and a low magnetic permeability. In other words, an achondrite can be 
> very porous and allow water to seep through it and not showing any 
> ferromagnetism.
> 
> It is like talking about density and dense. Everything has a density but 
> iron meteorites are dense.
> Everything have magnetic permeability but iron meteorites have strong 
> ferromagnetism.
> 
> http://en.wikipedia.org/wiki/Ferromagnetism
> 
> Personally I will continue to use the more relaxed term of magnetic and 
> then explain it "Just like a piece of iron that is attracted by a 
> magnet." if the listener doesn't understand what I mean.
> 
> Disclaimer : I'm only a physicist so what do I know...  ;-)
> 
> /Göran