  We extend our investigation of the normal modes of small adiabatic
oscillations of relativistic barotropic thin accretion disks to the
inertial-pressure (p) modes. We focus here on the lowest frequency fundamental
p-modes, those with no axial or vertical nodes in their distribution. Through a
variety of analyses, we obtain closed-form expressions for the eigenfrequencies
and eigenfunctions. These depend on the luminosity and viscosity parameter of
the disk as well as the mass and angular momentum of the black hole via
detailed formulae for the speed of sound. The effect of a torque on the inner
edge of the disk is also included. We compare the p-mode properties to those of
the g- and c-modes.
