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'''Phase space''' is the name given to a coordinate-momentum space.
Phase space is the means by which the mechanical problem is converted in to geometry.
It is the means by which a mechanical problem can be  converted in to a geometrical problem.
'''Phase space''', or <math>\Gamma</math>-space, is a Euclidean space in <math>2s</math> dimensions  
Phase space, sometimes written as  <math>\Gamma</math>-space, is an Euclidean space in <math>2s</math> dimensions  
(''i.e.'' <math>E^{2s}</math>), where <math>s</math>
(''i.e.'' <math>E^{2s}</math>), where <math>s</math>
is the number of [[degree of freedom |degrees of freedom]].
is the number of degrees of freedom.
Thus a description of a system in terms of positions and velocities
Thus our description of our system in terms of positions and velocities
now becomes a point in phase space (known as a ''phase point''). Changes in the system now trace out a trajectory
now becomes a point in phase space. Changes in our system now trace out a trajectory
in phase space (known as a ''phase trajectory'').
in phase space.  
Two different phase trajectories cannot pass through the same phase point.
One important property of phase space is that, for a long period of time, the phase-trajectory
will spend an equal amount of time in equal volume elements.
==See also==
*[[Liouville's theorem]]
*[[H-theorem]]
[[category: statistical mechanics]]
[[category: statistical mechanics]]
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