So, antimatter as a form of matter (made of elementary antiparticles) is a
kind of substance, the first class citizen of Aristotle's categories. (01)
----- Original Message -----
From: "John F. Sowa" <sowa@xxxxxxxxxxx>
To: "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>
Sent: Friday, September 21, 2007 4:06 PM
Subject: Re: [ontolog-forum] entity: nothing (03)
> > also, if Ontology is based on Aristotle's categories,
> > then which category does antimatter fit?
> Re Aristotle: His work has certainly been more influential
> than any other single contribution over the centuries, but
> very few of the current ontologies adopt Aristotle's categories
> Re antimatter: The term "anti" may be misleading, because antimatter
> is of exactly the same nature as ordinary matter: it has mass, it
> obeys all the ordinary laws of physics, and a large object composed
> entirely of antimatter would look very much like one composed of
> ordinary matter.
> The reason why it is called antimatter is that it reacts violently
> with ordinary matter to create an enormous amount of energy.
> For example an electron and an anti-electron (also called a
> positron) annihilate one another by generating high-energy
> gamma rays.
> This process is of the same nature as what happens with ordinary
> matter in an atomic bomb or a hydrogen bomb. It just happens to be
> more complete -- i.e., all the mass is converted to energy, not
> just a small fraction of the mass.
> Therefore, ontologically, antimatter is just a form of matter.
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