Calibration error and measurement error. Also, if the measurements are of different objects there may be random error.
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line measurement- distance between two lines end measurement- distance between two faces
Length is the measurement of distance between two points.
There are no "the two" factors. 2 and 4 are two factors.
Eight inches is a measurement of length whereas a cup is a measurement of volume. They are two completely different types of measurement.
You can't compare these two as millimeters are a measurement of length and grams are a measurement of weight.