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Length, when referring to measurement in one dimension (as in the length of a line segment or a or a piece of string), has a specialized meaning. So does height when it is used in conjunction with base.
This means that 1 meter is the standard used for the measurement of the length and that measured length is 5 times greater than the length of 1 meter. The unit of measurement is defined as the standard used for the measurement of the physical quantity. In the above example of the length of the rod, meter is the unit of measurement of length, while the number 5 which gives the amount of the length is called as magnitude of length.