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Arabic numerals are used for quantities with units of measure (see , Numbers and Percentages, Use of Numerals). By SI convention, it is preferable to use only numbers between 0.1 and 1000 and to use the appropriate prefix for expressing quantities. For example, 0.003 mL is expressed as 3 μL; 15 000 g is expressed as 15 kg. Some clinical measurements are expressed in quantities and units that may have numbers outside this preferred range. For such values, the use of scientific notation is acceptable.20 000 000 A may be expressed as 20 million amperes or as 2 × 107 Less