  This study examines the transverse and longitudinal properties of hard disks
confined in narrow channels. We employ an exact mapping of the system onto a
one-dimensional polydisperse, nonadditive mixture of hard rods with equal
chemical potentials. We compute various thermodynamic properties, including the
transverse and longitudinal equations of state, along with their behaviors at
both low and high densities. Structural properties are analyzed using the
two-body correlation function and the radial distribution function, tailored
for the highly anisotropic geometry of this system. The results are
corroborated by computer simulations.
