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From Wikipedia


In geometric measurements, length most commonly refers to the longest dimension of an object.

In certain contexts, the term "length" is reserved for a certain dimension of an object along which the length is measured. For example it is possible to cut a length of a wire which is shorter than wire thickness. Another example is FETtransistors, in which the channel width may be larger than channel length.

Length may be distinguished from height, which is vertical extent, and width or breadth, which are the distance from side to side, measuring across the object at right angles to the length.

Length is a measure of one dimension, whereas area is a measure of two dimensions (length squared) and volume is a measure of three dimensions (length cubed). In most systems of measurement, the unit of length is a fundamental unit, from which other units are defined.


Measurement has been important ever since man settled from his nomadic lifestyle and started using building materials; occupying land and trading with his neighbours. As society has become more technologically oriented much higher accuracies of measurement are required in an increasingly diverse set of fields, from micro-electronics to interplanetary ranging.

One of the oldest units of length measurement used in the ancient world was the 'cubit' which was the length of the arm from the tip of the finger to the elbow. This could then be subdivided into shorter units like the foot, hand (which at 4 inches is still used today for expressing the height of horses) or finger, or added together to make longer units like the stride. The cubit could vary considerably due to the different sizes of people. As early as the middle of the tenth century it is believed that the Saxon king Edgar kept a "yardstick" at Winchester as the official standard of measurement. A traditional tale tells the story of Henry I (1100–1135) who decreed that the yard should be "the distance from the tip of the King's nose to the end of his outstretched thumb".

After Albert Einstein's Special Relativity, length can no longer be thought of being constant in all reference frames. Thus a ruler that is one meter long in one frame of reference will not be one meter long in a reference frame that is travelling at a velocity relative to the first frame. This means length of a an object is variable depending on the observer.


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. Units of length may be based on 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 fixed object.

In the International System of Units (SI), the basic unit of length is the meterand is now defined in terms of thespeed of light. The centimeterand thekilometer, derived from the meter, are also commonly used units. InU.S. customary units, English or Imperial system of units, commonly used units of length are the inch, thefoot, theyard, and themile.

Units used to denote distances in the vastness of space, as in astronomy, are much longer than those typically used on Earth and include the astronomical unit, thelight-year, and theparsec.

From Yahoo Answers

Question:I'm planning on getting an iguana and building a cage that will be big enough for it throughout its life. I've read that 4 x 4 x 6 are the minimum dimensions, but I need to build a cage that will fit through doors.

Answers:If you get a female green iggy; males grow to be larger and will need a larger set up. Females grow to be an average of 4 ft long, and males will easily get 6 ft long. If you are starting with a baby, you are going to want to progressively move the cage size up as they grow. Putting a baby in a huge cage will cause stress, and stress leads to lethargy and lack of appetite. Babies are also near impossible to sex, so you'd be playing russian roulette with the sex. You could always build the cage in a way that it could be taken apart into sections in order to move it in and out of rooms.

Question:What is the height, length and width of a 1/4 lb. cube of butter? I have a take home science experiment which requires this information but I have no butter to try this with. Please help me. My estimated density is 113.4 grams.

Answers:I don't have a stick of butter to measure...but it would be the dimensions of one stick. There are four sticks, in one pound. :)

Question:When we are given are given a three dimensional object, for example a simple cube or something, how do we determine which part is the length, the breadth and the width? Is there some relationship between these regarding their lengths?

Answers:For a stand alone three dimensional object it straight forward. length is the longest side breadth is the thickness (shortest dimension) width is the dimension equal to a value between the first two This changes when you talk about HEIGHT, Width and Breadth Say you are taking about a dead end wall whose height = 3m and thickness of 200mm spanning across a 6 meters wide road. The length is the width of the road. The height is just the height. the breadth is the thickness. So you can either say it is 6m wide or 6m long. Whether the height is 10m. it will not be called the length. In this case the length/width is the horizontal length and not necessarily the longest.

Question:If I have a cube that weighs 113.4 grams what could the length, width and height be? The cube is made out of butter.

Answers:the length width and height could be anything your missing a peice of the puzzle what it the box made out of assuming eack cubic centimeter is 1g well 5,6,3.78

From Youtube

The Volume Movie - Length, Width, and Height :Get This Song on CD or MP3: www.havefunteaching.com The Volume Song and movie teaches students how to find the volume of a solid figure. Learn how to solve and find the volume of a 3D rectangular prism shape using length times width times height.