A Unit of Measurement is a definite magnitude of a Quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of Quantity.
Any other Quantity of that kind can be expressed as a multiple of the Unit of Measurement.
Note:
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The metre is a Unit of length that represents a definite predetermined length. When we say 10 metres (or 10 m), we actually mean 10 times the definite predetermined length called "metre".
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Measurement is a process of determining how large or small a physical Quantity is as compared to a basic reference Quantity of the same kind.
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Each Quantitative-Property is assigned to a Quantity and a possible empty set of alternate Unit of Measure which must belong to the same Quantity.
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The Aspect-of-conversion relates a Unit of Measure to the base Dimension of the underlying Unit system(s) in terms of exponents of the base Units.
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The Aspect of Conversion defines the scales of composed Unit of Measure along the Unit system's Dimensions.