by 
Parsec13
ANSWERS: 3
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Density of neutron star: around 10^17 to 10^18 kg/m^3 Density of black hole: ... Tricky ... Problem is GR says the size in comoving coordinates is zero so density is infinite. QM says it can't be infinite but must have some finite size. But it must be very small. Perhaps of the order of 10^-35m. Which would make the density of a small black hole around 10^135 kg/m^3 A mere 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 times denser.
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Well, a supermassive black hole, such as the one believed to be at the center of our galaxy should be less dense than water. But the smaller the black hole the more dense it becomes.
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There is a measure for the density of a neutron star but not a black hole, it is immeasureable... If a black hole has an infinitely stong gravitiational pull then therefore it must have an infinate density? Because anything that gets pulled into the black hole will be compacted and compacted to a solid mass of infinate density... I think :S
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