The space we live in is three-dimensional space. The three dimensions are commonly called length, width, and breadth, though there is really no difference between the meaning of the three words. In giving the dimensions of a box you could call any edge the length, any edge at right angles to the first the width, and the edge at right angles to the first two the breadth (or height). 2-dimensional renderings (ie. ... In general English usage, length (symbols: l, L) is but one particular instance of distance – an objects length is how long the object is – but in the physical sciences and engineering, the word length is in some contexts used synonymously with distance. Height is vertical distance; width (or breadth... In general English usage, length (symbol: l) is but one particular instance of distance – an objects length is how long the object is – but in the physical sciences and engineering, the word length is in some contexts used synonymously with distance. Height is vertical distance; width (or breadth) is... In general English usage, length (symbols: l, L) is but one particular instance of distance – an objects length is how long the object is – but in the physical sciences and engineering, the word length is in some contexts used synonymously with distance. Height is vertical distance; width (or breadth...

According to Einstein, our familiar three-dimensional space is really part of a larger four-dimensional space-time, and string theory predicts that there may be up to 26 physical dimensions. Albert Einstein, photographed by Oren J. Turner in 1947. ... In special relativity and general relativity, time and three-dimensional space are treated together as a single four-dimensional pseudo-Riemannian manifold called spacetime. ... Interaction in the subatomic world: world lines of pointlike particles in the Standard Model or a world sheet swept up by closed strings in string theory String theory is a model of fundamental physics whose building blocks are one-dimensional extended objects (strings) rather than the zero-dimensional points (particles...