The thermodynamic properties, phase transitions and transport properties of fluid in carbon nanotubes and other nanoporous materials are very different than bulk fluids. This is a result of the highly curved nature of such materials, the interactions of the adsorbate with the surfaces, and the relative importance of adsorbate-adsorbate and adsorbate-surface interactions. In this talk the use of quantum mechanics (to obtain appropriate gas-surface interactions), simulation )to obtain both adsorption isotherms and transport properties), and then solving macrosopic transport equations to obtain fluxes will be discussed.