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Measurement has been important ever since humans settled from nomadic lifestyles and started using building materials, occupying land and trading with neighbours. As trade between different places increased, the need for standard units of length increased. And later, as society has become more technologically oriented, much higher accuracy of measurement is required in an increasingly diverse set of fields, from micro-electronics to interplanetary ranging.

Under Einstein's special relativity, length can no longer be thought of as being constant in all reference frames. Thus a ruler that is one metre long in one frame of reference will not be one metre long in a reference frame that is moving relative to the first frame. This means the length of an object varies depending on the speed of the observer.

In Euclidean geometry, length is measured along straight lines unless otherwise specified and refers to segments on them. Pythagoras's theorem relating the length of the sides of a right triangle is one of many applications in Euclidean geometry. Length may also be measured along other types of curves and is referred to as arclength.

In a triangle, the length of an altitude, a line segment drawn from a vertex perpendicular to the side not passing through the vertex (referred to as a base of the triangle), is called the height of the triangle.

The area of a rectangle is defined to be length × width of the rectangle. If a long thin rectangle is stood up on its short side then its area could also be described as its height × width.

The volume of a solid rectangular box (such as a plank of wood) is often described as length × height × depth.

The perimeter of a polygon is the sum of the lengths of its sides.

The circumference of a circular disk is the length of the boundary (a circle) of that disk.

In other geometries, length may be measured along possibly curved paths, called geodesics. The Riemannian geometry used in general relativity is an example of such a geometry. In spherical geometry, length is measured along the great circles on the sphere and the distance between two points on the sphere is the shorter of the two lengths on the great circle, which is determined by the plane through the two points and the center of the sphere.

In an unweighted graph, the length of a cycle, path, or walk is the number of edges it uses. In a weighted graph, it may instead be the sum of the weights of the edges that it uses.

Length is used to define the shortest path, girth (shortest cycle length), and longest path between two vertices in a graph.

In measure theory, length is most often generalized to general sets of ${\displaystyle {\mathbb{R}}^n}$  via the Lebesgue measure. In the one-dimensional case, the Lebesgue outer measure of a set is defined in terms of the lengths of open intervals. Concretely, the length of an open interval is first defined as

 

so that the Lebesgue outer measure ${\displaystyle {\mathrm{\mu <!--\; \mu \; -->}}^{\ast <!--\; \ast \; -->}(E)}$  of a general set ${\displaystyle E}$  may then be defined as^[6]

${\displaystyle {\mathrm{\mu <!--\; \mu \; -->}}^{\ast <!--\; \ast \; -->}(E)=inf\left\{\underset{k}{\sum <!--\; \sum \; -->}\mathrm{\ell <!--\; \ell \; -->}(I_k):I_k\text{ is a sequence of open intervals such that }E\subseteq <!--\; \subseteq \; -->\underset{k}{\bigcup <!--\; \bigcup \; -->}{I}_k\right\}.}$ 

In the physical sciences and engineering, when one speaks of units of length, the word length is synonymous with distance. There are several units that are used to measure length. Historically, units of length may have been derived from the lengths of human body parts, the distance travelled in a number of paces, the distance between landmarks or places on the Earth, or arbitrarily on the length of some common object.

In the International System of Units (SI), the base unit of length is the metre (symbol, m), now defined in terms of the speed of light (about 300 million metres per second). The millimetre (mm), centimetre (cm) and the kilometre (km), derived from the metre, are also commonly used units. In U.S. customary units, English or imperial system of units, commonly used units of length are the inch (in), the foot (ft), the yard (yd), and the mile (mi). A unit of length used in navigation is the nautical mile (nmi).^[7]

1.609344 km = 1 miles

Units used to denote distances in the vastness of space, as in astronomy, are much longer than those typically used on Earth (metre or kilometre) and include the astronomical unit (au), the light-year, and the parsec (pc).

Units used to denote sub-atomic distances, as in nuclear physics, are much smaller than the millimetre. Examples include the fermi (fm).

• Arc length
• Humorous units of length
• Length measurement
• Metric system
• Metric units
• Orders of magnitude (length)
• Reciprocal length