# Phase space

## Space of all possible states that a system can take / From Wikipedia, the free encyclopedia

#### Dear Wikiwand AI, let's keep it short by simply answering these key questions:

Can you list the top facts and stats about Phase space?

Summarize this article for a 10 year old

SHOW ALL QUESTIONS

In dynamical systems theory and control theory, a **phase space** or **state space** is a space in which all possible "states" of a dynamical system or a control system are represented, with each possible state corresponding to one unique point in the phase space. For mechanical systems, the phase space usually consists of all possible values of position and momentum variables. It is the direct product of direct space and reciprocal space.^{[clarification needed]} The concept of phase space was developed in the late 19th century by Ludwig Boltzmann, Henri Poincaré, and Josiah Willard Gibbs.^{[1]}

For other uses, see Phase space (disambiguation).