A system is characterized by its STATE - macroscopic, measurable quantities like the pressure,temperature, volume, composition.  The thermodynamics of a system will depend on the pressure, temperature, volume occupied by the system
	To define the thermodynamical properties of a system, they have to de defined at given pressure, temperature, etc of the system.
	Process - path that the system undergoes while changing from an initial to a final state,
	There maybe many paths or processes which can take a system from an initial state to the same final state.