The density is the mass divided by the volume:

The density of a neutron is

So we see that the density of a neutron star is very close to that of a neutron. This means that the neutrons in a neutron star must be packed very close together, with very little empty space.

Example 11.2 Neutron degeneracy pressure Compare the neutron degeneracy pressure in a neutron star with the electron degeneracy pressure in a white dwarf.


Pns b

1 X 101

Example 11.3 Acceleration of gravity on a neutron star

For the star in the above example, find the acceleration of gravity at the surface solution g=

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