  We evaluate the equation of state of the quasi-one-dimensional (1D) phase of
C60 molecules in small carbon nanotubes, nicknamed ``peas in a pod''. The
chemical potential and 1D pressure are evaluated as functions of the
temperature and density, initially with the approximation of nearest neighbor
interactions and classical statistical mechanics. Quantum corrections and
long-range interaction corrections are discussed, as are the effects of
interactions with neighboring peapods. Transition phenomena involving the 3D
coupling are evaluated.
