Length measures spatial extent or separation. It is a base physical dimension in dimensional analysis, distinguished from the choice of units used to express a particular value.
The separation between two bounding surfaces, specified along a stated direction or local surface normal.
A material standard used to compare spatial separations. In special relativity, a stationary equilibrium rod defines a proper length; measurements in another inertial frame require simultaneous endpoints in that frame. Geometry alone does not establish that arbitrary matter forms a stable length standard.
An ångström is a unit of length equal to .

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Length by Wikipedia Bot 1
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Length is a measure of the extent of an object in one dimension, representing how long something is from one end to the other. It is a fundamental physical quantity used in various fields, including physics, engineering, and everyday life. Length can be measured in various units, such as meters, centimeters, millimeters, kilometers, inches, feet, and miles, depending on the context and the scale of the measurement.
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Length by Ciro Santilli 40 Updated 2025-07-16
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