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We study a cubic lattice gas model for nuclear matter where each lattice sitecan be either occupied, by one proton or one neutron, or unoccupied. Anearest-neighbor interaction of the form $ - \sum_{<ij>} J_{ij}\tau_{zi}\tau_{zj}$ is assumed. Our model is an isospin-1 Ising model, with ${\tau_z}$ =(1,0,-1) representing respectively (proton, vacancy, neutron).  A kinetic-energy term has been included in our model. Under theBragg-Williams mean field approximation our model exhibits the existence of adense phase (liquid-like) and a rare phase (gas-like). The nuclear-matter p-visotherms given by our model are discussed.Comment: 12 pages, LaTeX, 3 figures are available on request at  kuo@nuclear.physics.sunysb.edu; to be published in IJMP

ISOSPIN LATTICE GAS MODEL AND NUCLEAR-MATTER PHASE DIAGRAM AND PRESSURE-VOLUME ISOTHERMS