What is the difference between phase space and state-space?

[student-engineer]

In state space, the coordinates are the state variables of a system.So,each point in state space represents a specific value of state variables.Thus,state space representation represents the changes in a dynamical system. The state variables are the minimum number of variables which uniquely define the dynamics of a system. What is the difference between state space and phase space.

 

[hilbert2]

The term state space can be used in many contexts, including a thermodynamical system, e.g. the state space of an ideal gas consists of points with coordinates (P,V,N), while the term phase space always means a set of coordinates and momenta of a system in classical mechanics.