Length

In general English usage, length (symbols: l, L) is but one particular instance of distance – an object's 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 a lateral distance; an object's width is less than its length. No one speaks of "the length from here to Alpha Centauri", but rather of "the distance from here to Alpha Centauri," but when one speaks of distance more abstractly, one says "A kilometre or a mile, is a unit of length" or "...of distance", and the two statements are synonymous. Likewise, a mountain might be a mile in height. Length is the metric of one dimension of space. The metric of space itself is volume, or (length)3. Length is commonly considered to be one of the fundamental units, meaning that it cannot be defined in terms of other dimensions. However, a set of units can be constructed where units of length can be derived from fundamental physical constants - see Planck units and Planck length.

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Colloquially length sometimes refers to duration, especially when used in context of music.

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Distance: :This article is about distance in the mathematical / physical sense. For other uses, see distance (disambiguation)....

Vertical: An object is in a vertical position when it is aligned in an "up-down" direction, perpendicular to the horizon....

Alpha Centauri: :This article is about the star system. For the computer game, see Sid Meier's Alpha Centauri....

Length related Images and Photos (experimental)

Victoria: Full Length Portrait Photograph	Half Length Portrait of an Arab Boy	Full Length Illustration of W G Grace	Half-Length Portrait of the Film Actress Fern Andra
James I Half-Length Portrait	Half-Length Portrait of the Film Actress Pina Menichelli	Half-Length Portrait of the Film Actress Diomira Jacobini	Model Modeling Elbow Length Gloves
A Full Length Portrait of Empress Eugenie (1826-1920)	Half-Length Portrait of the Famous English Poet Alfred Tennyson	Full Length Portrait of Joseph Mallord William Turner R. A. (1755-1851)	Half-Length Portrait of the Famous French Author Alexandre Dumas Fils