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On the other hand, engineering notation allows the numbers to explicitly match their corresponding SI prefixes, which facilitates reading and oral communication. For example, {{val|12.5e-9|u=m}} can be read as "twelve-point-five nanometers" (10<sup>−9</sup> being ''nano'') and written as 12.5 nm, while its scientific notation equivalent {{val|1.25e-8|u=m}} would likely be read out as "one-point-two-five times ten-to-the-negative-eight meters".
Engineering notation, like scientific notation generally, can use the [[E-notation]], such that {{val|3.0e-9}} can be written as 3.0E−9 or 3.0e−9. The E (or e) should not be confused with the [[E (mathematical constant)|exponential ''e'']] which holds a completely different significance. In the latter case, it would be shown that 3''e''<sup>−9</sup> ≈ {{val|0.00037023}}.
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