It is well known that when fluids are confined in small pores, their properties change from those in bulk. The thermodynamics, for instance is modified; the phase diagram is strongly affected by the pore size and by the interaction of the fluid with the pore surface. Moreover, the coexistence lines of the fluids are shifted respect to the bulk as a result of the confinement. They might be shifted towards higher or lower temperatures depending on the fluid and the pore characteristics. On the other hand, the dynamics and the structure of the fluids can also be modified in narrow pores.