Because measurement would have no meaning, unless we agree what we are measuring by. If I say that it takes 14 BGs to fill an autograft- we need to agree what a BG is, and what an autograft is, or it is meaningless. If you say that a yard is about so big, and I say that it is smaller... do you not see the problem here? Standard units are necessary, or we are talking about different things, entirely. If I count to ten, but you skip 9 and go to 11, we are talking about different things. Thus, we have a standard model of math, and a standard model (several to choose from) of measurements. The bottom line answer is this: so we are talking about the same thing.
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Unit
Well the SI unit of length is the meter, and SI is the first standard measurement system...
By unit of length and distance and conversion ,we can say that meter is a a standard unit of measurement
The ounce is a unit of mass but it can also be used as a unit of volume. It is not a standard international unit. A standard unit of mass is kilogram and unit for volume is cubic metres. 1000 L = 1 m3
Si unit