three-dimensional space is a geometric model of the world in which we live.Three-dimensional, it is called because it corresponds to the description of the three unit vectors having the direction of the length, width and height.Perception of three-dimensional space is developed at the very early age and is directly related to the coordination of human motion.The depth of his perception depends on the ability of visual awareness of the world and the ability to identify the three dimensions with the help of the senses.

According to analytic geometry, three-dimensional space at every point is described by three values â€‹â€‹characterize, called coordinates.Coordinate axes are perpendicular to each other, the point of intersection constitute the origin, having a zero value.The position of any point in space is defined with respect to three axes having a different numerical value to each predetermined interval.Three-dimensional space in each of its points is defined by three numbers corresponding to the distance from a reference point on each coordinate axis to the point of intersection with a predetermined plane.There are schemes such coordinates as the spherical and cylindrical systems.

In linear algebra the concept of three-dimensional measurement is described by the concept of linear independence.Three-dimensional physical space because the height of an object does not depend on its width and length.In the language of linear algebra, the space is three-dimensional because each individual points can be determined by a combination of the three vectors are linearly independent.In this formulation, the concept of space-time is four-dimensional value because the point position at different times does not depend on its location in space.

Some properties that have three-dimensional space, kachesvenno differ from those spaces that are in other dimensions.For example, a knot tied by a rope, located in a lower measured.Most of the physical laws related to the measured three-dimensional space, for example, the inverse square law.In three-dimensional space may be two-dimensional, one-dimensional and zero-dimensional space, while it itself is considered part of a four-dimensional model of the space.

isotropic space is one of its key properties in classical mechanics.Isotropic space called because when you turn the frame of reference for any arbitrary angle changes in measurement results does not occur.The law of conservation of angular momentum is based on isotropic properties of space.This means that in the space of all directions are equal and there is no specific direction to the definition of an independent axis of symmetry.Isotropy has the same physical properties in all possible directions.Thus, isotropic space - it is such a medium, the physical properties of which do not depend on the direction.