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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.
First unit: meter (m) is used for measuring length. Second: foot (ft) is unit of length. The feet unit number 3.28 ft converts to 1 m, one meter. It is the EQUAL length value of 1 meter but in the feet length unit alternative.