The definition of space in physics is contentious. Various concepts used to try to define space have included:
In classical physics, space is a three-dimensional Euclidean space where any position can be described using three coordinates. relativistic physics examines spacetime rather than space; spacetime is modeled as a four-dimensional manifold.
Philosophical questions concerning space include: Is space absolute or purely relational? Does space have one correct geometry, or is the geometry of space just a convention? Historical Eminences who have taken sides in these debates include Isaac Newton (space is absolute), Gottfried Leibniz (space is relational), and Henri Poincaré (spatial geometry is a convention).
The term "inner space" has sometimes been used to describe the contents of the human mind.
See also: psychology
In some orthographies, a space is a blank area that serves as punctuation to provide interword separation.
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