Re: Question on GR sources
- From: Edward Green <spamspamspam3@xxxxxxxxxxx>
- Date: Sun, 24 Feb 2008 08:35:44 -0800 (PST)
On Feb 21, 1:34 am, Koobee Wublee <koobee.wub...@xxxxxxxxx> wrote:
On Feb 20, 7:17 pm, Edward Green < wrote:
<concerning the pressure and energy density of a gas, and their
appearance in the stress-energy tensor>
Either we can blindly plug in both terms, in or there is something
imperfect about the formulation.
Just a misunderstanding on your part.
A gas has an energy density, a gas has a pressure. Prima facie these
are different physical measures, even if they are connected behind the
scenes. If a theory has slots for pressure and for energy density,
but we are instructed by some ancillary set of rules to only use one
or the other in a given situation, then the original theory was
imperfectly specified.
Just what is my misunderstanding?
.
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