Why are the units for quantities so confusing?

On this website we adhere to the common practice of writing units for all scientific quantities using positive or negative superscripts. For example, instead of writing micrograms per cubic meter as μg/m3, we write it as μg m-3. In this case the negative subscript indicates that there are a given number of micrograms of an air pollutant "per" cubic meter of air. Remember from algebra that negative subscripts indicate that one takes the reciprocal of the quantity.

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