[LibWhacker]

A perfect gas obeys the pv = RT state equation.

'Ya got me, RW. None of the other laws of physics are known to hold inside a black hole, so I'm not sure this one would hold, either. How do you define pressure when the mass of a billion stars has been squeezed down to a mathematical point and the volume is zero? Very, very little of this stuff makes any sense to me. But I love it nonetheless! :-)

[RightWhale]

You still have p, v, R, and T, but in such abstruse mathematical forms that they don't lend themselves well to mental images. They lost me yesterday with that Lorentz symmetry violation. Diffeomorphism? Serious.

[RightOnTheLeftCoast]

"...the mass of a billion stars has been squeezed down to a mathematical point and the volume is zero..."

A common misconception. The fact is, we don't know what goes on inside the event horizon. The average mass density of a galactic-mass black hole need not be any greater than that of sea-level air.